Katzmann, J.
The defendant, Rupert A. Weeks, was found guilty by a Superior Court jury of unlawful possession of a firearm without a licence, in violation of G. L. c. 269, §
10(a),
and not guilty of unlawful possession of ammunition without a firearm identification card (G. L. c. 269, §
10[h]),
and assault by means of a dangerous weapon (G. L. c. 265, § 15B[¿>]). He then waived his right to a jury trial on the charge of carrying a firearm without a license, subsequent offense. A Superior Court judge found the defendant guilty on that charge. The defendant now appeals from his conviction of possession of a firearm under G. L. c. 269, § 10(a), and possession of a firearm, subsequent offense, under G. L. c. 269, §
10(d).
The defendant contends that the judge’s admission of docket sheets to prove prior convictions during the subsequent offense trial violated his confrontation rights under the Sixth Amend
ment to the United States Constitution. He also raises various trial issues.
1.
Certified docket sheets and confrontation clause.
During the jury-waived trial on the subsequent offense charge, the Commonwealth introduced two certified copies of conviction (the certified convictions) to prove that the defendant had been convicted of unlawful possession of a firearm on two prior occasions.
The defendant’s trial counsel objected on the grounds that introduction of the certified convictions violated his Sixth Amendment confrontation rights as recognized in
Crawford
v.
Washington,
541 U.S. 36 (2004)
(Crawford).
The judge overruled the objection, holding that the certified convictions complied with the requirements of G. L. c. 233, § 76, and were admissible under that statute.
We review the judge’s decision to determine if an error occurred and whether that error was “harmless beyond a reasonable doubt.”
Commonwealth
v.
Rosario,
430 Mass. 505, 511 (1999), quoting from
Commonwealth
v.
Miles,
420 Mass. 67, 73 (1995). See
Commonwealth
v.
Vasquez,
456 Mass. 350, 356 (2010).
In the aftermath of
Crawford,
this court articulated two reasons in support of our holding that docket sheets did not trigger the right of confrontation. See
Commonwealth
v.
Crapps,
64 Mass. App. Ct. 915, 916 (2005). First,
Commonwealth
v.
Verde,
444
Mass. 279, 280 (2005), held that “a drag certificate is akin to a business record and the confrontation clause is not implicated by this type of evidence.” We ruled that a docket sheet, like a drug certificate, is a business record and thus does not trigger the confrontation clause.
Commonwealth
v.
Crapps, supra.
Second, we determined that a docket sheet was not testimonial “because authors of prior conviction records are not witnesses against criminal defendants.”
Id.
at 916 n.3, citing
People
v.
Shreck,
107 P.3d 1048, 1060-1061 (Colo. Ct. App. 2004) (docket sheets are business records that are explicitly exempt from the
Crawford
standard). See
Commonwealth
v.
Maloney,
447 Mass. 577, 591-592 (2006) (holding that G. L. c. 278, § 11 A, allowing record of conviction to serve as prima facie evidence of prior conviction, did not violate confrontation clause).
In June, 2009, the United States Supreme Court overturned
Commonwealth
v.
Verde, supra,
and held that the admission of certificates of drug analysis violated a criminal defendant’s Sixth Amendment confrontation rights. See
Melendez-Diaz
v.
Massachusetts,
129 S. Ct. 2527, 2542 (2009) (Melendez-Diaz:). The Supreme Court stated that testimonial hearsay includes affidavits made under “circumstances which would lead an objective witness reasonably to believe that the statement would be available for use at a later trial.”
Id.
at 2531, quoting from
Crawford,
541 U.S. at 52. The Court focused on the fact that “under Massachusetts law the
sole purpose
of the [drug certificate] affidavits was to provide ‘prima facie evidence of the composition, quality, and the net weight’ of the analyzed substance.”
Id.
at 2532, quoting from G. L. c. 111, § 13.
The Commonwealth here argues that the certified convictions are not testimonial hearsay because they qualify as business records. In
Melendez-Diaz, supra
at 2538, the Supreme Court stated that “[documents kept in the regular course of business may ordinarily be admitted at trial despite their hearsay status .... But that is not the case if the regularly conducted business activity is the production of evidence for use at trial.” The Court also clarified that “public records are generally admissible absent confrontation . . . because — having been created for the administration of an entity’s affairs and not for the purpose of establishing or proving some fact at trial — they are not testimonial.”
Id.
at 2539-2540
Therefore, in order to determine whether the certified convictions are testimonial, we must ascertain whether certified records of convictions are created for the ‘‘administration of an entity’s affairs” or “for the purpose of establishing or proving some fact at trial.” Certified records of convictions are created to establish the fact of adjudication, so as to promote accountability to the public regarding official proceedings and public knowledge of the outcomes of those proceedings. See
Boston Herald, Inc.
v.
Sharpe,
432 Mass. 593, 606 (2000) (criminal court records open to public under the First Amendment as a “check” on the courts). See also
Roe
v.
Attorney Gen.,
434 Mass 418, 435 & n.26 (2001) (“[R]ecords of conviction are public records that are constitutionally required to be public”), citing
Globe Newspaper Co.
v.
Fenton,
819 F. Supp. 89, 100-101 (D. Mass. 1993) (First Amendment right to records of convictions). They are used for a number of administrative purposes, including background checks and parole records. See G. L. c. 6, §§ 172C, 172D, 172E, 172F. Unlike drug certificates, docket sheets are not prepared for an upcoming case and are not testimonial since the authors are not witnesses against the criminal defendant.
See
Commonwealth
v.
Martinez-Guzman,
76 Mass. App. Ct. 167, 171 n.3 (2010) (“Unlike the certificates at issue in
Melendez-Diaz,
which are created solely to prove an element of the prosecution’s case, [Registry of Motor Vehicles] records are maintained independent of any prosecutorial purpose and are therefore admissible in evidence as ordinary business records under G. L. c. 233, § 78, as well as pursuant to G. L. c. 233, § 76”);
Commonwealth
v.
McMullin,
76 Mass. App. Ct. 904, 904-905 (2010) (admission of court records and record of Registry of Motor Vehicles records did not violate the defendant’ s Sixth Amendment right of confrontation). See also
Commonwealth
v.
Bowden,
447 Mass. 593, 599 (2006) (no difference between Registry of Motor Vehicles records and court records). Contrast
Commonwealth
v.
Nardi,
452 Mass. 379, 393 (2008), quoting from
Commonwealth
v.
Slavski,
245 Mass. 405,
417 (1923) (autopsy reports prepared by “public officers concerning
causes and effects
involving the exercise of
judgment and discretion,
expressions of opinion, and making conclusions” are inadmissible testimonial hearsay).
Furthermore, the docket sheets are not testimonial under the two-part inquiry set forth in
Commonwealth
v.
Gonsalves,
445 Mass. 1, 3 (2005), cert. denied, 548 U.S. 926 (2006). First, the docket sheets are not “testimonial per se” because they are not “made in a formal or solemnized form (such as a deposition, affidavit, confession, or prior testimony) or in response to law enforcement interrogation.” See
Commonwealth
v.
Simon,
456 Mass. 280, 297 (2010), citing
Commonwealth
v.
Gonsalves, supra
at 13. Second, the docket sheets are not “testimonial in
fact” because, as we have discussed above, given the purposes for which they are created, and in light of the fact that they are not created for the purpose of any pending litigation, it would not reasonably be anticipated that they would be used against an accused. Compare
Commonwealth
v.
Avila,
454 Mass. 744, 763 n.20 (2009) (hearsay statement in expert report made for purpose of upcoming litigation is testimonial in fact) with
Commonwealth
v.
Simon,
456 Mass. 280, 299 (2010) (hearsay statement by victim to 911 dispatcher for purpose of “resolving the present emergency and not at conducting an investigation” not testimonial in fact), quoting
Commonwealth
v.
Nesbitt,
452 Mass. 236, 248 (2008), and
Commonwealth
v.
Linton,
456 Mass. 534, 550 (2010) (hearsay statement by victim to father “to explain to her father what had happened” not testimonial in fact). In short, certified docket sheets of conviction are distinguishable from drug certificates and do not constitutionally require cross-examination.
Finally, the defendant points to
Kirby
v.
United States,
174 U.S. 47 (1899), noted in
Melendez-Diaz.
There the United States Supreme Court discussed the confrontation clause question raised by the use of a record of prior conviction, as presented in
Kirby.
“In
Kirby
v.
United States,
174 U.S. 47 (1899), ... the Court considered Kirby’s conviction for receiving stolen property, the evidence for which consisted, in part, of the records of conviction of three individuals who were found guilty of stealing the relevant property.
Id.
at 53. . . . Though this evidence proved only that the property was stolen, and not that Kirby received it, the Court nevertheless ruled that admission of the records violated Kirby’s rights under the Confrontation Clause.
Id.
at 55.”
Melendez-Diaz,
129 S. Ct. at 2534.
Kirby
is distinguishable and not controlling here. In that case, the government sought to use the record of convictions of third persons to prove that the property in the defendant’s case was stolen. 174 U.S. at 53. In other words, in
Kirby,
the records of conviction were introduced not to demonstrate the fact of conviction, but the underlying evidentiary fact, that the goods were
stolen. It was a violation of Kirby’s confrontation rights because he was not allowed to cross-examine any witnesses with respect to that evidentiary element.
Id.
at 55-56. In the present case, the Commonwealth seeks to use records of the defendant’s prior convictions to prove that he had been convicted before, not to prove an underlying evidentiary fact. See
Bisaccia
v.
Attorney Gen.,
623 F.2d 307, 313-314 (3d Cir. 1980) (Seitz, C.J., concurring). Their admission did not violate the defendant’s Sixth Amendment rights.
2.
Trial issues. Background.
On the night of January 29, 2005, the residents at 20 Tremont Street in Brockton hosted a birthday party. Six police officers conducted surveillance of the party on the basis of information they received in a telephone call that night.
Victoria Lassiter and three of her friends stood by the door at 20 Tremont Street to search people entering the party for alcohol or weapons.
Between 11:00 p.m. and midnight, two men arrived at the party and approached the door. Lassiter found a bottle of liquor on one of the men and told him he could not enter the party with it. After the men stood in front of the house for ten to fifteen minutes, they discarded the bottle, and Lassiter further searched them. She felt something heavy in the pocket of one of the men, and she saw the grip of a gun. This man was wearing a green camouflage army windbreaker, and Lassiter later identified the man as the defendant.
The two men stood outside the house, and other partygoers began to converge around them. The police officers conducting surveillance moved toward the crowd and saw a man on the ground being kicked. Lassiter testified that the man in the camouflage windbreaker pulled out a gun and fired it two or three times in the direction of a restaurant. The crowd dispersed chaotically in the immediate aftermath of the gunshots.
The police officers converged on the scene outside 20 Tremont Street from three different angles. With their guns drawn, the officers ordered everyone to the ground. Six of the party-goers ran toward Detectives Hilliard and Carde, including the defendant. The defendant ducked between a parked car and a
snowbank. Detective Hilliard drew his weapon and yelled for the defendant to emerge with his hands up. He recognized the defendant immediately because they had had prior interactions.
Detective Hilliard frisked the defendant, and he searched the area where the defendant had ducked for a weapon. After Detective Hilliard did not find any contraband, he released the defendant. Detective Hilliard decided to search the area where the defendant had been hiding more thoroughly, and he saw the butt of a gun protruding from the snowbank. The gun found in the snowbank was a .22 caliber revolver with four live bullets and four empty shells in the cylinder. Detective Hilliard radioed the other officers to detain the defendant if they spotted him. Approximately one hour after the gunshots, police officers stopped a car outside 20 Tremont Street. Four men were in the car, including the defendant, who was in the back seat on the driver’s side. The driver gave the police permission to search the car. Although the officers found no guns or other contraband, they found a camouflage jacket concealed in the trunk.
On appeal, the defendant raises three trial issues, claiming error relating to gang affiliation evidence, and to the Commonwealth’s opening statement and closing argument, and that the evidence was insufficient.
a.
Admission of defendant’s gang affiliation.
Prior to trial, the Commonwealth moved in limine to admit evidence of the defendant’s affiliation with the North Side gang known as the “Annis Ave. Soldiers.” The defendant’s counsel opposed the motion because of the risk of unfair prejudice to his client. In the alternative, he proposed that the judge ask prospective jurors during the voir dire a question about whether gang membership would affect their impartiality and give a limiting instruction about gang membership. The prosecutor appeared to agree to this suggestion. The judge decided that the evidence was admissible, but barred the use of the word “gang” because of undue prejudice to the defendant. He ruled that using “young men” or “group of young men” from the North Side would minimize the risk of undue prejudice. The judge did not ask a question about gang membership to prospective jurors during the voir dire. Also, he
did not issue a limiting instruction to the jurors regarding gang membership. The defendant did not object in either instance.
During the Commonwealth’s opening statement, the prosecutor classified the dispute as between “[gjroups of young men that hang around together and basically have a street beef, going on for a long time. The North Siders, according to this information, were going to crash the birthday party at 20 Tremont Street.” At trial, numerous police officers testified to the North Side/South Side dispute, and that they were familiar with the defendant as a North Sider. While the defendant did not object to testimony regarding a North Side/South Side dispute, he did object when one officer mentioned the defendant’s affiliation with the “Annis Ave. Soldiers.” The judge sustained the objection and told the counsel at sidebar that “[t]he question from the North Side or the South Side, the Annis Street area, is admissible. But, you know, saying the word gang, as in Hell’s Angels, has the same connotation when you say a member of the Annis Street Soldiers. It conjures up the issue of a gang.” He cautioned the Commonwealth to avoid word usage such as a “soldier.”
The defendant contends that the evidence of gang affiliation was irrelevant and unfairly prejudicial. While the Commonwealth presented the incident at 20 Tremont Street as a fight between rival groups, the defendant contends that it was simply a brawl among partygoers, and gang affiliation did not serve to establish the identification or the motive of the shooter.
It is well-established that “gang affiliation evidence is admissible to show motive, and . . . deference [is given] to trial judges’ determinations of the risk of unfair prejudice arising from such evidence.”
Commonwealth
v.
John,
442 Mass. 329, 337 (2004). See
Commonwealth
v.
Correa,
437 Mass. 197, 201 (2002);
Commonwealth
v.
Swafford,
441 Mass. 329, 332 (2004);
Commonwealth
v.
Smith,
450 Mass. 395, 399 (2008). The prosecutor is “entitled to present as full a picture as possible of the events surrounding the incident itself.”
Commonwealth
v.
Bradshaw,
385 Mass. 244, 269-270 (1982). In this case, the prosecutor presented evidence that the defendant was a known member of the North Side and that individuals from the North Side had a dispute with people from the South Side. The evidence showed
that the party and subsequent fight occurred in the south side of Brockton, and, at the least, the defendant participated in the fight, and partygoers were chanting “North Side” and “South Side.” Given these facts, we agree with the Commonwealth that this evidence was relevant to prove the defendant’s motive for having a gun and firing it. See Mass. G. Evid. § 401 (2010).
When gang affiliation is relevant to the defendant’s motive, “it is within the discretion of the judge to weigh the probative value of the evidence against its prejudicial effect.”
Commonwealth
v.
Correa, supra
at 201. See
Commonwealth
v.
Perez,
47 Mass. App. Ct. 605, 608 (1999) (“Although it was agreed that the participants in the trial would refer to the Latin Kings as an ‘organization’ rather than as a ‘gang,’ that effort to shield the jury, though probably foredoomed to futility, was likely the most that the judge could do to minimize prejudice. The judge could hardly minimize prejudice to the defendants in the jury selection process without asking the potential jurors [as she did] whether their impartiality would be impaired by evidence of a defendant’s gang membership”). Accordingly, the judge did not abuse his discretion by permitting the Commonwealth to introduce evidence of the defendant’s affiliation with the North Side group and its dispute with the South Side. See
Commonwealth
v.
Dunn,
407 Mass. 798, 807 (1990).
While the defendant contends otherwise, we further conclude that the judge’s decision not to question prospective jurors about gang membership or issue a limiting instruction about the Commonwealth’s evidence of the defendant’s gang affiliation did not create a substantial risk of a miscarriage of justice. To be sure, questioning prospective jurors during voir dire about gang membership and issuing a limiting instruction regarding gang affiliation can serve to adequately minimize prejudice. See
Commonwealth
v.
Maldonado,
429 Mass. 502, 505 (1999);
Commonwealth
v.
Correa,
437 Mass. at 201;
Commonwealth
v.
Swafford,
441 Mass. at 333;
Commonwealth
v.
John,
442 Mass. at 338-339. But in this case, the Commonwealth presented strong evidence
that tied
the defendant to the gun, and an eyewitness — Victoria Lassiter — identified the defendant as the man who tried to enter the party with the gun. Also, she saw that same man fire the gun during the fight. Detective Hilliard spotted the
defendant ducking down between a parked car and a snowbank, and he found the gun concealed in the snowbank. According to testimony, the defendant was the only person in that vicinity in the aftermath of the gunshots.
We are not “left with uncertainty that the defendant’s guilt has been fairly adjudicated” as required to reverse under the substantial risk of a miscarriage of justice standard.
Commonwealth
v.
Randolph,
438 Mass. 290, 294-295 (2002), quoting from
Commonwealth
v.
Azar,
435 Mass. 675, 687 (2002). Finally, the jury acquitted the defendant on two of the three counts against him, which “suggests that they approached their duty dispassionately and were not inflamed.”
Commonwealth
v.
Bly,
444 Mass. 640, 655 (2005).
b.
The prosecutor’s opening statement and closing argument.
The defendant did not object at trial to the Commonwealth’s opening statement or closing argument. Hence, we review the defendant’s claims of error for a substantial risk of miscarriage of justice. See
Commonwealth
v.
Randolph, supra
at 297-298. We consider the claims of improper argument in the context of the entire argument, the instructions to the jury, and the evidence at trial.
Commonwealth
v.
Beland,
436 Mass. 273, 289 (2002).
First, regarding the Commonwealth’s opening statement reference to the alerting call to the police,
the defendant has not shown that the prosecutor did not have a good faith belief that he would be able to prove that fact.
Commonwealth
v.
Burke,
414 Mass. 252, 262 (1993). It could indeed be argued that evidence of the call was admissible, not for its truth, but rather to explain why the police happened to be stationed in the area. With respect to the references of hostility between the groups,
the judge had already indicated that such evidence would be admissible.
Second, the prosecutor’s closing argument, taken as a whole,
did not inappropriately vouch for the witness, Lassiter.
See
Commonwealth
v.
Mayne,
38 Mass. App. Ct. 282, 286 (1995); Smith, Criminal Practice and Procedure § 35.29 (3d ed. 2007). The prosecutor did not inject his own personal beliefs about the credibility of Lassiter. He indeed asked the jury to consider whether they thought she was credible and whether they thought she was lying. In fact, the prosecutor told the jury that it was their job to determine her credibility, not his, and to apply their recollection of the evidence, not his.
Third, the portion of the prosecutor’s argument about it being difficult for Lassiter to testify was merely a comment on the evidence that was presented at trial,
noting it was difficult for Lassiter to come forward as a witness. Where, as here, there is evidence of a witness’s fear of testifying, “a prosecutor may argue that it took ‘courage’ or ‘character’ for a witness to testify.”
Commonwealth
v.
Pina,
430 Mass. 266, 269 (1999), citing
Commonwealth
v.
Jackson,
428 Mass. 455, 461 (1998).
Fourth, the defendant claims that the prosecutor appealed to the jury’s sympathy by asking them to disregard inconsistencies in the police officers’ testimony. Actually, the prosecutor pointed out those inconsistencies, arguing that this was grounds to believe the officers.
“The credibility of witnesses is obviously a proper
subject of comment. Police witnesses are no exception.”
Commonwealth
v.
Murchison,
418 Mass. 58, 60 (1994). That such statements by the prosecutor were unlikely to elicit sympathy or otherwise inflame the jury is shown by the jury’s acquittal on two of three charges. See
Commonwealth
v.
Bly,
444 Mass. at 654-655.
Fifth, although it is inappropriate to reference facts that are not supported by the admitted evidence, see
Commonwealth
v.
Santiago,
425 Mass. 491, 499-500 (1997), in the instant case, such reference to the telephone call to the police in the closing did not go to the heart of any material issue of the trial.
See
Commonwealth
v.
Marquetty,
416 Mass. 445, 451 (1993) (prejudicial errors related to collateral issues does not require reversal). The defendant’s remaining claims of the prosecutor’s references to facts not in evidence lack merit.
Finally, we note that in his preliminary and final jury instructions, the judge informed the jury that opening statements and closing arguments are not evidence, that it was the jury’s memory of the evidence and not the memories of the attorneys that was controlling, and that it was the function of the jury to decide the case based solely on the evidence. These instructions minimized any possible prejudice. See
Commonwealth
v.
Costa,
414 Mass. 618, 629 (1993). Viewed in the context of the trial as a whole, the prosecutor’s opening statement and closing argument did not create a substantial risk of a miscarriage of justice.
c.
Denial of required finding of not guilty.
The defendant argues that the judge erroneously denied his motion for a required finding of not guilty on the charge of possession of a firearm. The defendant maintains that there was insufficient evidence to support this conviction for two reasons. First, the defendant contends that there was insufficient evidence to show that he possessed the firearm. Second, he claims there was insufficient evidence that the gun was a firearm under G. L. c. 269, § 10(a).
Under the familiar standard, we review the evidence in the light most favorable to the Commonwealth, asking whether “any rational trier of fact could have found the essential elements of the crime beyond a reasonable doubt.”
Commonwealth
v.
Latimore,
378 Mass. 671, 677 (1979), quoting from
Jackson
v. Virginia, 443 U.S. 307, 318-319 (1979).
First, the evidence produced at trial was sufficient to permit the jury to infer that the defendant possessed the firearm. The defendant was found wearing the same clothing that the witness described was worn by the shooter. The defendant hid between a snowbank and a car, where police found the gun, and Detective Hilliard testified that nobody else had been in that area. In addition, Lassiter testified that she saw the defendant with a gun and later identified him as the person with the gun. The jury were entitled to disregard her failure to identify the defendant in court based on the evidence that she was afraid of being involved. Even though the jury could have made other inferences, they could reasonably infer that the defendant possessed the gun and hid it in the snowbank. See
Commonwealth
v.
White,
452 Mass. 133, 136 (2008);
Commonwealth
v.
Duncan,
71 Mass. App. Ct. 150, 153-154 (2008).
Second, the evidence was also sufficient to permit the jury to conclude that the gun constituted a working firearm under G. L. c. 140, § 121, and thus to sustain a conviction under G. L. c. 269, § 10(a). See
Commonwealth
v.
Sampson,
383 Mass. 750, 753 (1981). “The burden on the Commonwealth in proving that the weapon is a firearm in the statutory sense is not a heavy one. It requires only that the Commonwealth present
some
competent evidence from which the jury reasonably can draw inferences that the weapon will fire.”
Commonwealth
v.
Nieves,
43 Mass. App. Ct 1, 2 (1997). See
Commonwealth
v.
Raedy,
24 Mass. App. Ct. 648, 654 (1987);
Commonwealth
v.
Prevost,
44 Mass. App. Ct. 398, 403 (1998), citing
Commonwealth
v.
Bartholomew,
326 Mass. 218, 220 (1950) (if only such slight repair, replacement, or adjustment required to make gun an effective weapon, gun will be deemed firearm within statutory definition). Here, there was evidence that the defendant was seen to have fired a gun, and Detective Hilliard testified that the gun was loaded when he found it, and that it contained four empty shells and four live rounds, all of which
was probative of operability. See
Commonwealth
v.
Mendes,
75 Mass. App. Ct. 390, 397 (2009) (evidence of operability included three audible shots, three empty casings). Moreover, a ballistics expert testified that he test fired the weapon after inserting a center pin from his inventory.
The center pin was missing when he received the weapon. The expert testified that the center pin serves to rotate the cylinder of the gun, and that it is possible to manually turn the cylinder and thus fire the gun without a center pin.
The testimony of the expert witness permitted the jury to conclude that the gun in question would fire, even without a center pin. Further, the arresting officers testified that there was a center pin in place when they found the weapon. Thus, a repair or adjustment was not even needed to fire the weapon. There was sufficient evidence presented for the jury to determine that the weapon was a firearm within the meaning of the statute. The defendant’s motion for a required finding of not guilty was appropriately denied.
Judgment affirmed.