The difference is surely an angled rear corner on Every single of the locking lugs that matches up with the angled corner within the barrel extension’s lugs. The rearwards drive from the fired spherical results in the bolt to rotate together All those angles right until it unlocks and all the things cycles rearwards.
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That’s correct, this is the blowback-operated firearm, but it surely isn’t a straight blowback. The bolt head actually locks into battery, rotating and locking its lugs into barrel extension lugs similar to a typical AR-15.
Swapping for The sunshine buffer fixed that wholly and also resulted in additional assured ejection of vacant brass.
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I'd a blast shooting this matter. Although my AAC Aspect 2 isn’t technically rated for 5.seven, I abused the heck from it with just about 400 rounds sent downrange Briefly order and more than a few mag dumps. It held up just high-quality and the Mk57 was relatively tranquil and intensely pleasant to shoot.
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Should really the gun fail to lock back again on vacant or if brief-stroking or other cycling troubles arise, you may want to swap for your light-weight buffer.
As we’ve found with all of CMMG’s GUARDs and BANSHEEs, the Mk57 is an extremely very well-sorted and effectively-tuned gun. Every little thing suits and capabilities completely and feels like it belongs with each other.
I here used to be amazed to see that the 55 grain Detroit Ammo subsonic rounds cycled quite reliably Along with the large buffer when suppressed, even though they didn’t throw the bolt back get more info again quite far sufficient to lock open on empty.