As CMMG created a model partially by supporting and innovating exclusive calibers in the AR platform, the addition of the 5.7x28mm Mk57 limited-barrel rifle in this article is likely only the beginning.

The projectiles would stick or drag in there plus the follower would bind. As being the ProMags haven't any inward-projecting part and go away way more clearance to the bullets, they had no these types of challenge and fed all the things.

Jeremy is TTAG's Deputy Editor, Functioning generally behind the scenes but, when he makes an attempt to jot down, he focuses on thorough gun & equipment reviews.

As it is possible to see from the sluggish-mo mag dump from the video clip earlier mentioned, five.7x28mm is super gentle-capturing. People lightweight bullets don’t create Substantially recoil as well as the delayed blowback program does its position, way too. The Mk57 merely stays parked right on concentrate on. It twitches rather than recoils.

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That’s correct, this can be a blowback-operated firearm, but it surely isn’t a straight blowback. The bolt head really locks into battery, rotating and locking its lugs into barrel extension lugs similar to a regular AR-fifteen.

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Unrelated to this post, but in your future flash hider test, I would like you to include a Griffin linear comp/m4sd mount.

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Both equally ProMags I applied labored flawlessly, as well as manufacturing unit 5-7 mag I'd did not. I’ll admit my normal practical experience with ProMag hasn't been solely favourable, so coloration me amazed that not simply get more info were they brilliant in this article Nonetheless they ended up Plainly a lot better than the OEM element. Even their extended, 30-spherical 5-seveN magazines get normally sound reviews.

I used to be amazed to notice that the 55 grain Detroit Ammo subsonic rounds cycled fairly reliably With all the weighty buffer when suppressed, while they didn’t toss the bolt again pretty considerably more than enough to lock open up on vacant.