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CMMG Mk4 K, .300 Blackout Upper Group
In stock at Cabelas
on 5-5-2018.
Product Description
Reliable performance and affordable accuracy, that's what CMMG's Mk4 K .300 Blackout Upper Group adds to your firearm. CMMG's RKM11 KeyMod free-floating handguard protects fingers from hot metal. The 12.5" barrel is crafted of nitrided 4140 chromoly steel with an accuracy-enhancing 1:7 rate of twist. Muzzle features a removable A2 compensator attached with 5/8"-24 threading. Forged 7075-T6 aluminum M4-type upper receiver. Pistol gas port. Covered by CMMG's lifetime quality guarantee. Made in USA.

Note: Upper used on rifle lower receiver must be accompanied with approved NFA paperwork showing legal possession of short-barrel rifle.

  • Reliable performance and affordable accuracy
  • CMMG's RKM11 KeyMod free-floating handguard
  • 12.5" nitrided barrel is 4140 chromoly steel
  • Barrel comes equipped with a removable A2 compensator
  • M4-type upper receiver made of forged 7075-T6 aluminum