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5.45x39
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AR-15 5.45X39 16" M4 Sporting Series Semi-Auto Rifle / MLOK - FFL transfer item. All NFA rules apply. Rifle Features Barrel: 16" 5.45X39 Nitride coated, CMV 4150 Twist: 1 in 8” Thread: 1/2x28 .750” Gas Block Diameter Carbine Gas System M4 flat upper receiv..AR-15 5.45X39 16" M4 Sporting Series Semi-Auto Rifle / MLOK -&...$799.95$999.95