Designed to provide superior ballistics and less felt recoil than most pistol caliber personal defense weapons 5.7x28mm has quickly become one of the most popular chamberings in the PDW space. With the 8" BANSHEE upper group you can build the PDW AR15 of your dreams. Compatible with either CMMG Mk57 lowers or a standard AR15/Mk4 lower (when used with CMMG 5.7 AR Conversion Mags). Available in six different Cerakote finishes all CMMG Upper Groups come complete with bolt carrier group and ZEROED accessories including: - ZEROED AR15 Polymer Dust Cover - ZEROED AR15 Ambi Charging Handle - ZEROED Linear Compensator 5.56mm - Radial Delayed Blowback Operating System - Lifetime Quality Guarantee Main Features Caliber: 5.7x28 FN Barrel Length: 8" Finish: Cerakote Standard Weight: 2.9 lbs Other Features Barrel Contour: MT Barrel Material: 4140CM, SBN Barrel Twist: 1:9 Caliber/Gauge: 5.7x28 Charging Handle: CMMG ZEROED Ambi Color: Black Hand Guard: CMMG EML7 M-LOK Length: 16.5" Material: Steel Aluminum Muzzle Device: CMMG ZEROED Linear Compensator Muzzle Thread: 1/2 x 28 Operating System: Radial Delayed Blowback Platform: Mk4, Mk57 Upper Receiver: Billet 6061 T6 Aluminum Upper Type: Complete Part Number: 57B88BD-AB UPC: 810097504387

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