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8 Inch 5.7x28mm Conversion Kit with Lightweight BCG The 5.7x28mm round, now available to convert your AR-15 to a high-velocity, low-recoil PDW. CMMG's Radial-Delayed Blowback system makes this kit incredibly...
Full Rifle Conversion Kit for 5.7x28mm AR-15 To squeeze the most velocity possible out of the 5.7x28mm, a 16 inch barrel slings lead faster than any of CMMG's MK57 kits. ...
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