MEMORANDUM
Jajuane Hankins (“Hankins”) appeals his. conviction for possession of a firearm by a felon in violation of 18 U.S.C. § 922(g)(1). He challenges the district court’s evidentiary ruling allowing the government to present evidence of a prior bad act relating to a similar offense. We have jurisdiction under 28 U.S.C. § 1291, and reverse and remand for a new trial.1
I
Hankins argues that the district court admitted evidence relating to a prior conviction for attempted possession of a firearm by a felon in violation of Rule 404(b) of the Federal Rules of Evidence. The government contends that evidence relating to Hankins’s prior bad act2 was admissible under the “knowledge” exception to [509]*509Rule 404(b). According to the government, Hankins’s involvement in the March 17, 2001 incident showed that Hankins knew about and had access to guns in Ursula Christmas’s closet and that, therefore, he had “control or dominion” over the Ruger handgun.3 “We review the district court’s decision to admit evidence of a prior bad act under Fed.R.Evid. 404(b) for an abuse of discretion.” United States v. Lewis, 837 F.2d 415, 418 (9th Cir.1988).4
A four-part test guides whether evidence should be admitted under Rule 404(b): “evidence of prior criminal conduct may be admitted if (1) the evidence tends to prove a material point; (2) the prior act is not too remote in time; (3) the evidence is sufficient to support a finding that defendant committed the other act; and (4) (in cases where knowledge and intent are at issue) the act is similar to the offense charged.” United States v. Mayans, 17 F.3d 1174, 1181 (9th Cir.1994). Here, there is no dispute that the prior bad act evidence met the second and third prongs of this test. However, we conclude that the challenged evidence did not tend to prove a material point and was not sufficiently similar to the offense charged.
A. Tendency to Prove a Material Point
Initially, at a pretrial hearing, the government offered numerous theories about why evidence of Hankins’s prior bad act might be relevant. Ultimately, the government settled on the theory of knowledge.5 “When the government’s theory is one of knowledge ... [we have] emphasized that the government must prove a logical connection between the knowledge gained as a result of the commission of the prior act and the knowledge at issue in the charged act.” Id. at 1181-82.
Here, the government explained that evidence relating to the March 17, 2001 incident showed that Hankins generally knew about and had access to guns in the downstairs hall closet in Christmas’s apartment. However, the government failed to “articulate precisely the evidential hypothesis” about what could logically be inferred from Hankins’s involvement in the March 17, 2001 incident. United States v. Mehrmanesh, 689 F.2d 822, 830 (9th Cir.1982) (emphasis added). Any inferences that could be drawn about Hankins’s general knowledge of guns in' Christmas’s closet were immaterial to the ultimate question of whether Hankins knowingly possessed the specific handgun at issue in this case.
B. Similarity
“[S]imilarity is necessary to indicate knowledge and intent, because it can fur[510]*510nish the link between knowledge gained in the prior act and the claimed ignorance of some fact in the offense charged.” Mayans, 17 F.3d at 1182 (internal quotation marks and citation omitted). The government argues that the circumstances surrounding the March 17, 2001 and May 29, 2001 incidents — i.e., the fact that both firearms were found in the same closet in the same apartment — are sufficiently similar to support a logical inference of relevance. This argument overlooks the obvious difference between the two incidents: the evidence relating to the prior bad act on March 17, 2001 involved a different firearm (an assault rifle) than the one at issue in this case (a Ruger handgun). Had Han-kins claimed that he had never, at any time, possessed a gun, the March 17, 2001 incident would have been relevant. However, Hankins only disputed that he knowingly possessed the Ruger handgun. In this context, the evidence of Hankins’s pri- or bad act involving a different gun was not sufficiently similar to “furnish the link” to the crime charged.
In sum, the government’s evidence relating to his prior bad act on March 17, 2001 did not tend to prove a material point and was not sufficiently similar to the presently charged offense, and thus did not qualify under the “knowledge” exception to Rule 404(b). Because the evidence served no purpose other than to show Hankins’s criminal disposition,6 the district court abused its discretion in admitting the government’s evidence of Hankins’s prior bad act.7
II
Even if the district court erred in admitting evidence of Hankins’ prior bad act under Rule 404(b), we will not reverse if the error was harmless. United States v. Seschillie, 310 F.3d 1208, 1214 (9th Cir. 2002). We consider a variety of factors to determine whether improperly admitted prior bad act evidence caused substantial harm, including the strength of the rest of the government’s case against the defendant, the extent to which the government emphasized the prior act evidence, and the presence of instructions “about the limited inferences” that jurors can draw from the evidence. Mehrmanesh, 689 F.2d at 832.
We begin by noting that, “[wjhere a prior conviction was for a gun crime or one similar to other charges in a pending case[,j the risk of unfair prejudice would be especially obvious.... ” Old Chief v. United States, 519 U.S. 172, 185, 117 S.Ct. 644, 136 L.Ed.2d 574 (1997). The fact that both firearms were found in the same hall closet of the same apartment undoubtedly heightened the risk that the jury would infer from the circumstances of the March 17, 2001 incident that Hankins knowingly [511]*511possessed the Ruger handgun on May 29, 2001.
Although the government presented other evidence — including evidence of Han-kins’s fingerprint on the magazine of the gun — the issue of whether Hankins knowingly possessed the Ruger handgun was a close one. The fact that the government resorted to impermissible references to the prior bad act on March 17, 2001 suggests that it was not confident in its ability to prove knowing possession in this case.
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MEMORANDUM
Jajuane Hankins (“Hankins”) appeals his. conviction for possession of a firearm by a felon in violation of 18 U.S.C. § 922(g)(1). He challenges the district court’s evidentiary ruling allowing the government to present evidence of a prior bad act relating to a similar offense. We have jurisdiction under 28 U.S.C. § 1291, and reverse and remand for a new trial.1
I
Hankins argues that the district court admitted evidence relating to a prior conviction for attempted possession of a firearm by a felon in violation of Rule 404(b) of the Federal Rules of Evidence. The government contends that evidence relating to Hankins’s prior bad act2 was admissible under the “knowledge” exception to [509]*509Rule 404(b). According to the government, Hankins’s involvement in the March 17, 2001 incident showed that Hankins knew about and had access to guns in Ursula Christmas’s closet and that, therefore, he had “control or dominion” over the Ruger handgun.3 “We review the district court’s decision to admit evidence of a prior bad act under Fed.R.Evid. 404(b) for an abuse of discretion.” United States v. Lewis, 837 F.2d 415, 418 (9th Cir.1988).4
A four-part test guides whether evidence should be admitted under Rule 404(b): “evidence of prior criminal conduct may be admitted if (1) the evidence tends to prove a material point; (2) the prior act is not too remote in time; (3) the evidence is sufficient to support a finding that defendant committed the other act; and (4) (in cases where knowledge and intent are at issue) the act is similar to the offense charged.” United States v. Mayans, 17 F.3d 1174, 1181 (9th Cir.1994). Here, there is no dispute that the prior bad act evidence met the second and third prongs of this test. However, we conclude that the challenged evidence did not tend to prove a material point and was not sufficiently similar to the offense charged.
A. Tendency to Prove a Material Point
Initially, at a pretrial hearing, the government offered numerous theories about why evidence of Hankins’s prior bad act might be relevant. Ultimately, the government settled on the theory of knowledge.5 “When the government’s theory is one of knowledge ... [we have] emphasized that the government must prove a logical connection between the knowledge gained as a result of the commission of the prior act and the knowledge at issue in the charged act.” Id. at 1181-82.
Here, the government explained that evidence relating to the March 17, 2001 incident showed that Hankins generally knew about and had access to guns in the downstairs hall closet in Christmas’s apartment. However, the government failed to “articulate precisely the evidential hypothesis” about what could logically be inferred from Hankins’s involvement in the March 17, 2001 incident. United States v. Mehrmanesh, 689 F.2d 822, 830 (9th Cir.1982) (emphasis added). Any inferences that could be drawn about Hankins’s general knowledge of guns in' Christmas’s closet were immaterial to the ultimate question of whether Hankins knowingly possessed the specific handgun at issue in this case.
B. Similarity
“[S]imilarity is necessary to indicate knowledge and intent, because it can fur[510]*510nish the link between knowledge gained in the prior act and the claimed ignorance of some fact in the offense charged.” Mayans, 17 F.3d at 1182 (internal quotation marks and citation omitted). The government argues that the circumstances surrounding the March 17, 2001 and May 29, 2001 incidents — i.e., the fact that both firearms were found in the same closet in the same apartment — are sufficiently similar to support a logical inference of relevance. This argument overlooks the obvious difference between the two incidents: the evidence relating to the prior bad act on March 17, 2001 involved a different firearm (an assault rifle) than the one at issue in this case (a Ruger handgun). Had Han-kins claimed that he had never, at any time, possessed a gun, the March 17, 2001 incident would have been relevant. However, Hankins only disputed that he knowingly possessed the Ruger handgun. In this context, the evidence of Hankins’s pri- or bad act involving a different gun was not sufficiently similar to “furnish the link” to the crime charged.
In sum, the government’s evidence relating to his prior bad act on March 17, 2001 did not tend to prove a material point and was not sufficiently similar to the presently charged offense, and thus did not qualify under the “knowledge” exception to Rule 404(b). Because the evidence served no purpose other than to show Hankins’s criminal disposition,6 the district court abused its discretion in admitting the government’s evidence of Hankins’s prior bad act.7
II
Even if the district court erred in admitting evidence of Hankins’ prior bad act under Rule 404(b), we will not reverse if the error was harmless. United States v. Seschillie, 310 F.3d 1208, 1214 (9th Cir. 2002). We consider a variety of factors to determine whether improperly admitted prior bad act evidence caused substantial harm, including the strength of the rest of the government’s case against the defendant, the extent to which the government emphasized the prior act evidence, and the presence of instructions “about the limited inferences” that jurors can draw from the evidence. Mehrmanesh, 689 F.2d at 832.
We begin by noting that, “[wjhere a prior conviction was for a gun crime or one similar to other charges in a pending case[,j the risk of unfair prejudice would be especially obvious.... ” Old Chief v. United States, 519 U.S. 172, 185, 117 S.Ct. 644, 136 L.Ed.2d 574 (1997). The fact that both firearms were found in the same hall closet of the same apartment undoubtedly heightened the risk that the jury would infer from the circumstances of the March 17, 2001 incident that Hankins knowingly [511]*511possessed the Ruger handgun on May 29, 2001.
Although the government presented other evidence — including evidence of Han-kins’s fingerprint on the magazine of the gun — the issue of whether Hankins knowingly possessed the Ruger handgun was a close one. The fact that the government resorted to impermissible references to the prior bad act on March 17, 2001 suggests that it was not confident in its ability to prove knowing possession in this case. In fact, the government made multiple references to Hankins’s prior bad act — during Officer Kryszezuk’s testimony on direct examination, Christmas’s testimony on cross-examination, and during closing argument. See United States v. Vizcarra-Martinez, 66 F.3d 1006, 1017 (9th Cir.1995) (noting that “the government relied heavily upon the evidence in question” by referring to the prior bad act multiple times during the trial). These multiple references to the circumstances surrounding Hankins’s prior bad act compounded the risk of prejudice to Hankins.
Although the district court gave limiting instructions to the jury, the instructions were too broad to prevent the jury from drawing impermissible inferences about Hankins’s character and criminal propensity. For example, Hankins never asserted a defense of mistake or accident. Nonetheless, the district court permitted the jury to consider the evidence of Han-kins’s prior bad act as it bore on his “knowledge, intent, preparation, plan or the absence of mistake or accident.” Without the guidance of more narrowly drawn limiting instructions, the jury likely engaged in impermissible speculation about how Hankins’s involvement in the March 17, 2001 incident reflected on his character and criminal propensity on May 29, 2001.
In light of these circumstances, we conclude that, more probably than not, the references to Hankins’s prior bad act had a “significant prejudicial effect upon the jury’s decision.” Id. (internal quotation marks omitted). Accordingly, we reverse the judgment of conviction and remand for a new trial.
REVERSED AND REMANDED.
This disposition, is not appropriate for publication and may not be cited to or by the courts of this circuit except as provided by Ninth Circuit Rule 36-3.