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Captain Ryan and his troops with a Colt M4 Carbine
Object type	Gun
Creator	Humans
Owner	Special Forces Tom Ryan Hilary Becker Leek's Organisation Sciswell Leek's Mercenary 1 Leek's Mercenary 2 Other humans
Appearances	Episode 1.2 Episode 2.5 Episode 3.7

The Assault Rifle is a selective fire rifle that uses an intermediate cartridge and a detachable magazine. One type of Assault Rifle is the Sig SG 552.

Captain Tom Ryan and his Special Forces troops used Colt M4 Carbine against the giant arachnids and Arthropleura in the London Underground. (Episode 1.2)

Sciswell and his two subordinate mercenaries working for Oliver Leek used Heckler & Koch G36Cs in the Silurian desert. They tried to use their weapons on the Silurian Scorpion that attacked them, but to no avail. Sciswell's two subordinates were killed. Sciswell later threatened Nick Cutter, Stephen Hart and Taylor Craig with his gun. He fired into the sand, and this disturbed a Silurian Scorpion, which arose, dragged him under the sand, and devoured him. (Episode 2.5)

Captain Becker and two of his soldiers wielded G36Cs to help Connor Temple persuade Tony to give Rex to him. (Episode 3.7)

Wikipedia has a more detailed and comprehensive article on Assualt Rifle