Introducing the SIG Sauer MCX
The SIG Sauer MCX is a multi-caliber rifle platform introduced at Shot Show 2015, available in 5.56, 300 Blackout, and 7.62x39mm. Key features include a user-changeable barrel system secured by captive T27 torque screws, a quick-change and removable handguard, and a self-regulating gas system adaptable for suppressed and unsuppressed use. The upper receiver incorporates a steel cam path insert and steel feed ramp for increased durability under aggressive unlocking conditions, and dual charging handle latch points for ambidextrous operation. The lower receiver is largely AR-15 compatible, featuring an integral trigger guard, flared magwell, and an oversized magazine release.













