Home CMMG Shooting 5.7×28 only needs your AR15 lower, our mag, and our upper.

Shooting 5.7×28 only needs your AR15 lower, our mag, and our upper.

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You can now shoot the incredible 5.7x28mm round using your AR15 lower. Just add our AR Conversion magazine and one of our Radial Delayed Blowback uppers and you’re ready to go! We even have bolt/barrel combos for builders.

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32 COMMENTS

  1. Until all the rounds shoot out of the magazine due to poor design and QC. New mags on the way… let’s see if they suck or not. I have my doubts because this issue was known a full 2 months before I got mine and I was assured it was fixed…. yet It is still happening.

  2. Sorry, I would rather have an AR57, and I hope you, or someone acquires it. 50 round mags are the best mags. Now with pistol braces and the AR57 pistol upper, I think it's time has come and no one is producing it.

    I wondered if shooting the AR57 would be hearing safe as it ejects down? It is full ambi. Did I say 50 round mags?

  3. Just want to say I really appreciate what this company is doing for the AR market.
    I can have the same gun, and now I can change it out to shoot multiple calibers. Very innovative and impressive!
    PS. Best customer service ever

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