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Mfg Item #: 55BA222
This .22 LR/Mk9 upper receiver assembly is made from forged 7075-T6 aluminum with a Type III hard anodized finish, and ships with a forward assist, dust cover and deflector. The Mk4 platform accepts standard AR15-style magazines, and is the most versatile of the CMMG platforms, especially with the .22 LR, 5.7x28mm (Conversion), and 9mm conversions. NOTE: Requires charging handle, barrel, handguard, gas block, muzzle device, gas tube and BCG (Bolt Carrier Group) to complete.