Shadow the Hedgehog
The following weapons appear in the video game Shadow the Hedgehog:
Heckler & Koch USP Tactical
The standard-issue sidearm for GUN soldiers in the game is the Heckler & Koch USP Tactical. When Shadow is confronted by the GUN Commander in a cutscene, the Commander attempts to shoot Shadow with his USP Tactical, but misses. The gun has a 10-round capacity in-game, and fires semi-automatically.
In some cutscenes, GUN soldiers can be seen with M1911A1 pistols, one of them being used to fatally wound Shadow's close friend, Maria Robotnik. A silhouette of an M1911A1 also appears on GUN supply crates. Shadow is seen holding an M1911A1 in promotional screenshots and the opening sequence, but he never uses one in game.
Heckler & Koch MP5A3
Another weapon used by GUN soldiers is the Heckler & Koch MP5A3 with the Navy trigger group. The gun is fully automatic with a 20-round per pickup capacity while used by Shadow. The opening title sequence of the game shows Shadow carrying a version of this weapon; interestingly, the weapon is charged by pumping it as if it were a pump-action shotgun.
SIG SG 551
The standard assault rifle used by GUN soldiers is the SIG SG 551. When picked up by Shadow, it has a 30-round capacity.
Another weapon used by GUN soldiers is the Milkor MGL grenade launcher with the stock and Armson OEG reflex sight removed.
Another weapon used by GUN soldiers is the M136 AT4 rocket launcher.
GE M134 Minigun
The various walker mechs used by GUN are armed with missile launchers and GE M134 Miniguns. When these mechs are destroyed, the miniguns can be picked up and used as a man-portable weapon. They are arguably the game's best weapons due to their high damage and rate of fire and due to their 40-round magazines, but they are somewhat usurped by their relative sparsity.