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10.5 MK18 Geissele FBI MK4 AR15 M4 Titanium Gold Upper

Featuring an SBR/pistol length version of the same rail used to fullfill contracts for the Federal Bureau of Investigation (FBI). A complete custom AR-15 M4 upper receiver group. Strength, modularity and M-Lok gives users the capabilities needed to successfully complete the mission at hand. Premium craftmanship includes a Titanium Nitride Bolt Carrier Group, Adjustable Stainless Steel Gas Block, and 10.5" Black Nitride QPQ Barrel with Stainless Steel extension. Compatible drop-in with any mil-spec AR15 lower receiver.

• Geissele Automatics MK4 9.5" Super Modular Rail

• 10.5" Premium 5.56 1:7 Black Nitride QPQ Stainless Steel Barrel

• Titanium Nitride TiN Gold Bolt Carrier Group

• Adjustable Stainless Steel Gas Block

• Stainless Steel Gas Tube Carbine Length
• Milspec Upper Receiver
• Enhanced Lower Parts Kit
• Aluminum AR15 Charging Handle
• A2 Flash Hider

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