The rifle build kit contains Mil-Spec and AR-15 Platform parts including: 16" Barrel 1:8 twist in 300 Blackout in a heavy contour barrel with a Nitride coating, 5/8"-24 TPI, Birdcage flash hider with crush washer, 15" Keymod free float handguard, AR15 5.56/.223/.300AAC stripped upper receiver with M4 feed ramps, Bolt Carrier Group and Aluminum charging handle. Lower Receiver is not included. from White River Armory (Product 300keymod16kit)

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