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Our MMR-556 uppers come ready to install on the lower of your choice. These uppers ship complete with our M16 cut nitride bolt carrier group, and GI charging handle. The MMR-556-U utilizes a 16” mid-length Ballistic Advantage 1:7 twist nitride barrel, and features our 15” Custombilt MLOK rail. These uppers are ready to shoot!
$778.00
Forged Upper Receiver:
• 7075-T6 Forged Aluminum
• T-Marked Flat-Top with Picatinny Rails
• Hard-Coat Anodized Mil 8625 Type 3 Class 2 – Matte Black
• Mil-Spec Charging Handle
Handguard:
•Custombilt 15” MLOK handguard,Hard-Coat Anodized Mil 8625 Type 3 Class 2 – Matte Black
Barrel (1:7 twist)
• 16″
• 4150 Chrome Moly Vanadium
• Nitride/QPQ Finish
• Thread: 1/2 x 28
• A2 Flash Hider
• Low profile 4140 nitride gas block
• Mid- Length Gas System
Custombilt M16 Bolt Carrier Group:
• Properly staked gas key
• Nitride Coated
• Laser Engraved Custombilt Logo
• HPT – High Pressure Tested
• MPI – Magnetic Particle Inspected
• 9130 Bolt
• 8620 Bolt Carrier