CMMG AR-15 M4 LE A3 Flat-Top Upper Assembly 300 AAC Blackout (7.62x35mm) 1 in 7" Twist 16" Barrel Pistol Gas System WASP Melonite Finished Chrome Moly Matte with M4 Handguard, Flash Hider Pre-Ban

Product #: 678190 CMMG #: 11091 UPC #: 815835010915

Product Information

The CMMG AR-15 M4 LE Upper Assembly in 300 AAC Blackout is ready for instant, drop-in use on any standard Mil-Spec lower receiver. The upper comes complete with a low profile single rail gas block, A2 flash hider, charging handle, bolt carrier group, and M4-style polymer handguards. Magazine not included.

The barrel is composed of Chrome Moly Steel and finished inside and out with CMMG's durable Weapons Armament Surface Protection (WASP) Melonite treatment. The unique Melonite treatment applied to the barrel surface-hardens the metal, extending barrel service life by reducing friction in the bore and lessening bore surface wear. Also referred to as Nitriding, this treatment produces an extremely hard, slick surface on steel that resists carbon adhesion and increases corrosion resistance, making for easier cleaning and maintenance. Nitriding converts the steel's surface without any build-up, retaining all of the benefits of traditional chrome lining without suffering the accuracy degradation commonly encountered due to uneven application of chrome inside the barrel's bore.

Technical Information
  • Upper Receiver: A3 Flat-Top
  • Barrel: 16" Medium Contour, Chrome Moly, WASP Melonite Treated, Threaded 5/8-24
  • Twist: 1 in 7"
  • Chamber: 300 AAC Blackout (7.62x35mm)
  • Flash Hider: A2
  • Gas System Length: Pistol with low profile gas block under the handguard
  • Handguard: Polymer M4-Style
  • Sights: None, Low Profile Single Rail Gas Block/Front Sight Base
  • Suitable for use with Subsonic loads, either Suppressed or Unsuppressed. Not recommended for supersonic loads, suppressed or unsuppressed
  • Compatible with all standard AR-15 magazines, Not Included


Click Here for Additional Info on Ammo Compatiblity with CMMG's 300 Blackout Uppers & Barrels

NOTE: All CMMG uppers are test fired at their facility before shipment to the end user.
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