Conversion Kits - 5.7x28
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CMMG MK57 5.7×28 8 Inch Radial Delayed Blowback AR 15 Barrel and BCG Kit
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...Only$424.95 -
CMMG MK57 5.7×28 16.1 Inch Radial Delayed Blowback AR 15 Barrel and BCG Kit
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. ...Only$449.95
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