As CMMG developed a brand partially by supporting and innovating distinctive calibers during the AR System, the addition of your five.7x28mm Mk57 limited-barrel rifle below is probably going only the start.ARMSLIST isn't involved with transactions concerning functions. Review our privateness policy and terms of use For additionalbarnbwt July 27, 2

The main difference is an angled rear corner on Each and every of the locking lugs that matches up with an angled corner inside the barrel extension’s lugs. The rearwards thrust from the fired spherical causes the bolt to rotate along Those people angles until eventually it unlocks and everything cycles rearwards.When incorporating or modifying a