The Colt M4A1 R.I.S is a high-end airsoft gun that consistently delivers stunning semi/full automatic suppressive firepower needed to advance your squad on the battlefield. This rifle is a full licensed & trademarked Colt replica and is manufactured by King Arms who have a solid reputation as a leader in high end airsoft products. The Colt M4A1 R.I.S has a durable polymer body and features a quad Weaver/Picatinny rail foregrip, a 300 rd magazine, and a shot velocity of 350-380 fps (using .20g BBs). Mount additional rifle scopes on the top Weaver/Picatinny rail found underneath the detachable carry handle. The gun's long range accuracy can also be dialed in by tweaking the adjustable hop-up unit. This is an excellent rifle for serious airsoft enthusiasts who need an upgradeable & high performing AEG.