The Sig Sauer Copperhead pistol features a one piece upper receiver. The lower receiver is outfitted with ambidextrous controls including the bolt release. The single stage trigger is very clean and predictable with very little pre-travel or over-travel. The 3.5 inch barrel features an integrated muzzle brake. Sig's new brace fits to the contour of your shoulder as it swivels left or right when needed. Once collapsed the overall length is only 14.5 inches! All of the controls are positioned very similarly to AR-15's. Both the rotating bolt and gas piston system make the Copperhead a very reliable and soft shooting 9mm firearm.