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r/57x28mm

▲ 88 r/57x28mm

Diamondback Made a Cool 5.7 and Nobody Noticed

Why they decided to launch this mid Covid, when 5.7 was 2$ a round and nobody cared, then never soft relaunch it I'll never know. But this thing is cool as hell. They made basically an AR 180 in 5.7 with a match barrel, adjustable gas, and really well designed upper then just never marketed it.

u/blipdot2 — 10 days ago
▲ 3 r/57x28mm+2 crossposts

Aluminum ST50

Has anyone put out a video reviewing the aluminum st50 kit? I was hoping that stuff and things or someone else would eventually make an aluminum kit as the poly st50 seems to have a lot of fitment issues. But now that stuff and things came out with their aluminum kit Im wondering if they fixed those issues.

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u/hotrodgreg — 9 days ago
▲ 16 r/57x28mm

M&P 5.7 with 407K?

Anybody running a m&p 5.7 with holosun 407K? I’m between that and the vortex CCW. Anything I should know? Any pictures? Bonus points if FDE pistol and optic. PFA

u/Leading-Round9768 — 10 days ago
▲ 29 r/57x28mm

Xm57

If anyone hasn’t seen the xm57 yet it’s worth checking out. Not sure if I’m allowed to post links in here but I’ll share link to the release video at least if I can

u/ForeTeeOowTuhZz — 11 days ago
▲ 3 r/57x28mm

CMMG RDB 5.7 8" Conversion Suppressed Issues

I'm using the CMMG 5.7 8" conversion with a traditional baffled can. I switched from the recommended standard buffer spring and carbine buffer to a Sprinco blue (+15% strength) buffer spring and an H2 buffer. After the first round in a mag, the bolt closes on an empty chamber. I assume mag friction is enough to slow the carrier that it is short stroking, but I'm not totally sure. I'm going to put a standard buffer spring in, but if anyone has experienced something similar and wants to save me the headache, please advise.

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u/Accurate-Side-8697 — 10 days ago