Home CMMG CMMG MK57 5.7x28mm Banshee

CMMG MK57 5.7x28mm Banshee

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The Mk57 is the newest addition to CMMG‘s line of Banshee pistols and SBRs. The firearm is chambered in the controversial 5.7x28mm cartridge which adds AR familiarity
to the arsenal of anyone interested in the 5.7 game. We have a full video discussing the inticacies of the the Banshee, intorduced earlier this year and thus, this video will focus
mainly on the differences pertinant to the MK57 and of course the 5.7 cartridge.

The MK57 is offered in two varients a 5″ and an 8″, both 1:9 Twist.the one pictured here is the 5″ pistol varient that comes equipped with the Gearhead works Tailhook Mod 2.
The SBR varients will be outfitted with CMMG‘s ripstock. Nuraled thread protecor and an RML4 Mlok Handguard complete the construction of the business end of the firearm.
The guts use CMMG‘s Radial Delayed blowback system pioneered for use in both the Banshee and Guard models, however, the Bolt carrier has been substantially lightened through skeletonizing
to reduce reciprocating mass and bring the gun’s recoil impulse to near zero.

All told the banshee weighs in under 5 lbs once you add in the ambidextrous controls, sling plate, Single stage trigger, and 20 round magazine.
You might be asking, what makes 5.7 so special?
Why is this cool? We are going to answer those questions with a wide range of tests.

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32 COMMENTS

  1. Wondered why it has been said "the guy who runs Gun Mag Warehouse is an anti gun son of a bitch"….Ive done a great deal a research and can't find anything to support it….but for some reason I trust the guy who said it…..as do you VSO

  2. Hello VSO Gunchannel, why do you say "controversial 5.7×28" cartridge? It's an excellently designed cartridge, a great performer, and great competitor/ alternative option to many common calibers. Right? I am genuinely very confused by your statement and would love an explanation. Thanks so much!

  3. It is interesting that for the 5.7 guard they have a weightless buffer where as the 9mm and 45 guards have a buffer kit. Pretty interesting since the max case pressure for the 5.7 is 50,000 PSI while the 9mm has a maximum case pressure of 35,000 PSI.

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