USED Sig Sauer MCX-Regulator 5.56

The MCX-REGULATOR is an alloy frame rifle with a gas-piston operating system, a Magpul™ SGA Mossberg 500/590 traditional stock combined with a redesigned lower receiver compatible with all MCX upper receivers. It has a fully ambidextrous magazine release, safety selector, and bolt catch. The MCX-REGULATOR ships with a two-stage match trigger, a cold hammer-forged carbon steel barrel, a SIG-designed muzzle brake. The MCX-REGULATOR offers a built in Arca rail for easy tripod mounting.