When Eric Murphy's (Kevin Connolly) cell phone rings while getting high in "The Script and the Sherpa", the Sherpa (Val Kilmer) and his friend Finley each draw a nickel M1911A1 before putting them away. An actor playing one of Pablo Escobar's thugs in the in-show film Medellin in "Welcome to the Jungle (4.01) uses a black M1911A1 to shoot a man in the head. During the same "film", Vincent Chase (Adrian Grenier) fires a nickel 1911 in his role as Pablo Escobar.
Browning M2
During the opening shot of "Welcome to the Jungle" (4.01), a Browning M2 can be seen mounted on a truck driving by in the background on the set of Medellin. However, it can be seen much more clearly in the Season 4 "Making of" documentary.
Norinco Type 56
Many of the extras (some hired from the Colombian Army according to the filmmakers) on Medellin in "Welcome to the Jungle" (4.01) carry Norinco Type 56 AK variants. Several other weapons are seen but are too far away or too briefly seen for clear identification. The AK-carrying actors in the film are portraying Pablo Escobar's cartel henchmen. Vincent Chase (Adrian Grenier) fires one as Pablo Escobar himself, seen in the fictional trailer for Medellin.
light machine gun
A Colombian soldier can be seen wielding a light machine gun on the Medellin set in "Welcome to the Jungle" (4.01), however the weapon is more clearly seen in the background on the Season 4 "Making of" documentary.
During the final day of production on Medellin in "Welcome to the Jungle" (4.01), Colombian Army soldiers fire M16A2s at Pablo Escobar's hideout in a scene. One of the soldiers is played by Johnny Drama (Kevin Dillon). These too are more clearly seen in the Season 4 "Making of" documentary.
Winchester Model 1200
In the Medellin trailer, first seen in "The Dream Team" (4.05), one of Pablo Escobar's cartel henchmen is seen carrying what appears to be a Winchester Model 1200 on the back of a truck.
A girl at the firing range in "Unlike a Virgin" (5.02) fires a Smith & Wesson Model 686. L.B. (Lukas Haas) takes one to the "Bullets & Bitches" bar to go meet E in the same episode. Another girl fires the same revolver with Nick's (Giovanni Ribisi) help in "Fire Sale" (5.04).
Remington 700
Nick (Giovanni Ribisi) takes a Remington 700 with black furniture to the "Bullets & Bitches" bar to go meet E in "Unlike a Virgin" (5.02).
Beretta 92FS Inox
A man at the firing range in "Fire Sale" (5.04) shoots a Beretta 92FS Inox while L.B. and Nick negotiate with E on the phone.