A Norinco Type 56-1 (Chinese AKS-47/AKMS) assault rifle is used by Frankie Maguire (Brad Pitt) during the opening gun battle in Belfast between the British Army and Maguire's IRA cell.
An M16A1 is used by the IRA terrorist "Desmond" (actor unknown) during the gun battle in Belfast. Another is used by one of Billy Burke's (Treat Williams') men during the scene where Frankie Maguire confronts him.
The SAS operators who attempt to apprehend Frankie Maguire and his crew are all armed with Heckler & Koch MP5A3 submachine guns. For some reason, the MP5s all have the older-style "slimline" forearm when the SAS men are in their car loading their weapons, but when the shootout begins, the MP5s all suddenly have the newer "tropical"/wide-type forearm.
When the shootout in Belfast ends, the Mi-5 agent Harry Sloan (Simon Jones) kills "Desmond" (actor unknown) with a Heckler & Koch P7M8 pistol after Desmond refuses to tell him where Frankie Maguire is hiding.
When Frankie Maguire (Brad Pitt) is visited in hiding by another IRA member, he comes out of his hiding spot brandishing a SIG-Sauer pistol of some type, most likely a SIG-Sauer P226.
[[Image:|thumb|none|600px|Another shot of Maguire with the SIG.]]
Unknown pistol (Beretta?)
When Frankie Maguire comes to America and assumes his new identity as Rory Devaney, he brings along an unknown semi auto pistol which looks almost like a Beretta Cheetah, but it has the safety mounted on the slide rather than the frame, like the Cheetah series.
Sergeant Tom O'Meara's (Harrison Ford's) service sidearm is a Smith & Wesson Model 10 with some type of custom rubber grip. It is seen most clearly in the climax when he confronts Frankie Maguire on his boat.
Tom O'Meara also carries a compact revolver of some sort as his backup weapon. It is seen clearly, but I can't tell what it is. At one point, Frankie Maguire takes this revolver from Tom and uses it in the later part of the movie.
A pistol-grip, short-barrled Ithaca 37 is used by one of Billy Burke's men when Frankie Maguire goes to the warehouse to get the missiles from them. Maguire himself also winds up using this shotgun to kill several of Burke's men.
After Frankie kills several of his men, Billy Burke (Treat Williams) dives into his car and comes out with a Ruger KP94 pistol, which he uses to shoot at Frankie.
The plot of this movie revolves around a plot by the IRA to acquire FIM-92A Stinger surface-to-air missiles, for which Frankie Maguire (Brad Pitt) is sent to the U.S. to make the purchase from arms dealer Billy Burke (Treat Williams). However, no Stingers ever appear on-screen during the entirety of the film (even though the trailer featured stock footage of a Stinger launcher being used). The only glimpse of the missiles that the viewers ever see are the cases which (allegedly) contain them, as seen below:
