5.7x28mm Bolt Carrier Groups for AR-15
Check out the latest conversion kit packages from CMMG with included barrel and BCG in the high-velocity 5.7x28mm round. The same round as the P90 and FiveSeven pistol.
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CMMG MK57 5.7×28 5 Inch Radial Delayed Blowback Barrel and BCG Kit for AR...
5.7x28mm Conversion Kit for PDW AR-15 Builds CMMG's Radial-Delayed Blowback system produces smoother recoil and less wear on the AR-15 than traditional blowback conversions. And they dropped this barrel and...Only$399.95
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