AR-15 Barrels in 5.7x28mm
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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
Check out the latest in pistol caliber carbines with these barrels chambered for the high-velocity 5.7x28mm round. This is the same caliber as the FN P90 submachine gun and FiveSeven pistol.
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