The police officers use AR-15/SP1 rifles as noted by their flat reciever lacking the forward assist. When fired in the movie, it is only in semi-automatic, further hinting it is an AR-15/SP1 and not an M16. When the guns fire fully automatic, they switch to M16A1s.
The M16A1 is used by several members of the police while they hunt down John Rambo. These guns replace the AR-15/SP1 when the officers fire fully-automatic. They are noted by their forward assists and full-auto fire. Members of the National Guard use them as well.
The M72 LAW(Light anti-tank weapon) is a 3 foot disposable single shot launcher capable of penetrating mutiple layers of armor. A member of the national guard fires one into the cave Rambo is hiding in, failing to kill him but trapping him in a cave.
While in a police chopper, Deputy Sgt. Arthur Galt (Jack Starrett) fires his Winchester Model 88 lever-action rifle at Rambo from a helicopter before falling to his death. Rambo kills two dobermans with the rifle and wounds their owner before it runs out of bullets.
Not a gun but still the star of the Rambo films, Rambo's knife is a survival knife with a screw open hilt butt filled with a suture needle and thread, a compass, and has gnarled teeth to cut barbed wire. It is so sharp it can cut paper like butter.
An officer can be seen briefly firing what looks like a Smith & Wesson Model 10 with a tapered barrel at Rambo when he drives the stolen personel truck.
In an alternate ending, Rambo has Col. Trautman (Richard Crenna) kill him with his Colt M1911A1 sidearm. Trautman aims the gun away but Rambo jams it to the gut and the gun kills him.
