271 F.3d 349 (1st Cir. 2001)
UNITED STATES, Appellee,v.GREGORY THOMAS MURRAY, Defendant, Appellant.
No. 01-1065
United States Court of Appeals For the First Circuit
Submitted Sept. 17, 2001Decided November 20, 2001

APPEAL FROM THE UNITED STATES DISTRICT COURT FOR THE DISTRICT OF MAINE
[George Z. Singal, U.S. District Judge]
Bruce Mallonee, Brent A. Singer and Rudman & Winchell, LLC, on brief for appellant.
Margaret D. McGaughey, Appellate Chief, and Paula D. Silsby, United States Attorney, on brief for appellee.
Before Lynch, Circuit Judge, Stahl, Senior Circuit Judge, and Lipez, Circuit Judge.
STAHL, Senior Circuit Judge.


1
Appellant Gregory T. Murray appeals from his conviction for knowing possession of a dangerous weapon in a federal facility, see 18 U.S.C. § 930(a) (1994 and Supp. II 1996). Murray argues that the district court erred in denying his motion for a judgment of acquittal pursuant to Rule 29 of the Federal Rules of Criminal Procedure. We affirm.

I.

2
On March 9, 2000, Murray entered the lobby of the Margaret Chase Smith Federal Building in Bangor, Maine, carrying a black powder pistol in a holster on his belt. Murray had been a frequent visitor at the building for the past eight years and had occasionally brought a Leatherman knife with him on these visits. He had been allowed to check the knife with the security personnel stationed at the x-ray machine and metal detector. On this occasion, Murray advanced to the metal detector, which was approximately six feet from the entrance to the building, past a set of sliding doors, a vestibule and another set of doors, and indicated that he wanted to check the pistol with the armed officers on duty. He was informed that civilians could not check guns and that he would have to leave the building. Murray did not leave but instead became irate. In the confrontation that ensued, Murray at one point put his hand on his weapon and did not comply with repeated instructions to turn the pistol over to the officers. Finally, after one of the officers managed to remove the pistol, Murray was restrained and arrested.


3
Subsequently, Murray was charged with forcibly assaulting, resisting, opposing, impeding, intimidating and interfering with officers and employees of the United States in violation of 18 U.S.C. § 111(a)(1) (Count I) and with possessing or causing to be present a dangerous weapon in a Federal facility in violation of 18 U.S.C. § 930(a) (Count II). With respect to Count II, the defendant moved for judgment of acquittal at the close of the government's case and again before closing arguments. Fed. R. Crim. P. 29(a). The court denied the motion in both instances. On August 24, 2000, the jury returned a verdict of not guilty on Count I, but found Murray guilty as to Count II. On November 22, 2000, Murray was sentenced to imprisonment for a term of three months. Murray now appeals the denial of the motion for judgment of acquittal on Count II.

II.

4
Murray was convicted of violating 18 U.S.C. § 930(a), which reads as follows: "[W]hoever knowingly possesses or causes to be present a firearm or other dangerous weapon in a Federal facility . . . or attempts to do so, shall be fined under this title or imprisoned not more than 1 year, or both."1 The parties stipulated that the Margaret Chase Smith Federal Building is a "federal facility" within the meaning of the statute, see 18 U.S.C. § 930(g)(1), and there was no question at trial (and has been no question on appeal) that the pistol Murray carried into the building, although old, was a "dangerous weapon" within the meaning of the statute, see 18 U.S.C. § 930(g)(2).


5
However, in his motion for judgment of acquittal Murray argued, and continues to argue on appeal, that section 930 prohibits only knowing violations of the statute and that he could not reasonably have known that possessing a pistol in the public lobby, before passing through the metal detector, violated the prohibition on dangerous weapons in the building. Murray's argument is essentially that he mistakenly believed that the prohibition applied only past the metal detector and x-ray machines, the point at which he expected to be able to check the pistol, and that no jury could have reasonably concluded that he thus knowingly violated the statute.


6
In support of the position that section 930 only prohibits knowing violations of the statute, Murray points out that the statute further requires that "[n]otice of the provisions of subsection[] (a) . . . shall be posted conspicuously at each public entrance to each Federal facility" and that "no person shall be convicted of an offense under subsection (a) . . . if such notice is not so posted at such facility, unless such person had actual notice of subsection (a) . . . ." 18 U.S.C. § 930(h). Murray contends that the fact that he had on previous occasions been allowed to check his knife at the metal detector and proceed into the building led him reasonably to believe that the same policy would apply to the pistol. He argues that, although notices of the prohibition were posted in the Margaret Chase Smith Federal Building, they were posted in ways that reinforced the lobby's status as a "neutral zone," because there were no signs outside the building and the more eye-catching signs were posted past the lobby. Finally, he points out that, had he simply left the building after having been told that he was not allowed to check the pistol, he would not have been charged with violating the statute; therefore, he contends, it follows that possessing a dangerous weapon in the lobby of the Margaret Chase Smith Federal Building is not prohibited by section 930(a).


7
We affirm a district court's denial of a motion for acquittal unless the evidence, when "'viewed in the light most favorable to the government, could not have persuaded any trier of fact of the defendant's guilt beyond a reasonable doubt.'" United States v. Hernandez, 218 F.3d 58, 64 (1st Cir. 2000), (quoting United States v. Paradis, 802 F.2d 553, 559 (1st Cir. 1986)), cert. denied 531 U.S. 1103 (2001). We find that there was sufficient evidence in this case for a jury to have found that Murray violated the statute beyond a reasonable doubt. Even if the appellant believed that he was not violating the prohibition against possessing dangerous weapons in a federal building when he entered the lobby of the Margaret Chase Smith Federal Building, he was clearly and immediately informed of the policy by the security personnel when he showed them the pistol. A jury could reasonably conclude that his conduct from that point forward was a knowing possession of a dangerous weapon in a federal building. Given that there was a legitimate question for the jury at least on this point, we need not consider whether the jury could reasonably have found that Murray violated the statute simply by bringing the pistol into the lobby, before he was informed of the policy against it -- a conclusion arguably supported because of the frequency with which he visited the building and had previously encountered the notices announcing the prohibition. A judgment of acquittal was thus properly denied and the question was correctly submitted to the jury.


8
Affirmed.



Notes:


1
 The statute excepts law enforcement officers, military personnel, and those lawfully carrying weapons incident to hunting or other lawful purposes. 18 U.S.C. § 930(d). Murray does not fit any of the exceptions.


