Foxtrot Mike (FM) Products AR-15 5.56MM FM-15 Gen 2 Complete Upper Receiver - 13.9" (Rainier Arms Exclusive)

The Foxtrot Mike Products FM-15 Gen 2 Side Charging AR-15 Upper Receiver features a unique dual spring recoil system nested in the top of the upper receiver allowing the use of a folding stock. This recoil system is paired with a mid-length direct impingement gas system and a proprietary lightweight bolt carrier group for a smooth and reliably functioning rifle. The gas block features an indexing pin and a coil pin to keep it locked in place against the lightweight contoured barrel for an extremely robust system.

Specifications:

• Caliber: .223 Wylde
• Op. System: Direct Impingement
• Barrel Length: 13.9”
• Barrel Contour: Lightweight
• Barrel Material: 41v50
• Barrel Twist: 1:8
• Muzzle Device: A2 Flash Hider
• Muzzle Thread: 1/2 X 28
• Receiver: Billet Aircraft Aluminum
• Weight: 3.8 lbs
• Length: 22.75”
• Handguard: 13.125” MLOK Free Float
• Charging Handle: 4-position Front Charge
• Gas System: Midlength
• Gas Block: 0.625” adjustable
• Finish: Type III Hard Black Anno.