Colt M933

The Colt Model 933 Carbine is a 11.5" barreled select fire Assault Rifle. It has a distinctive 'step down' in the barrel to allow for mounting the M203 grenade launcher. Many of them in the battlefield are customized with forearm rails. It has three round burst capability.

Users

 * US Special Forces
 * Lewis

In the Anime
After Saya's first Chiropteran encounter, a U.S. Special Forces team armed with Colt Model 933 carbines, secure the area. Later, Lewis is seen wielding a Model 933 when Kai approaches him on his motorcycle near the Yanbaru Research faculty. In both instances they are fitted with Surefire M900 weaponlight foregrips and EOTech red dot sights.