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Durable 16" chrome-moly barrel with 1:7 twist rate
15" MWI modular free-float rail
Carbine-length gas system and low-profile gas block
Includes one case (400 rounds) of .300BLK ammunition
Simply attach the forged 7075-T6 M4 flat-top upper to your AR-15 lower and use your standard magazines
Reliable and accurate, PNW Arms .300BLK/400 Rounds with 16" Upper Package enables you to convert your 5.56 NATO/.223 Rem. AR-15 platform to .300 Blackout. Simply attach the forged 7075-T6 M4 flat-top upper to your AR-15 lower and use your standard magazines. The 16" phosphate-coated 4150-chrome-moly barrel has a 1:7 twist rate for optimum accuracy. 15" MWI modular free-float hand guard offers a monolithic continuous top rail with three included Picatinny rail sections. V.2 Gunslinger charging handle with enlarged release catch is made of durable 6061-T6 aluminum for consistent tolerances and exceptional strength. Carbine-length gas system and low-profile gas block. Equipped with A2 flash hider. Includes one case (400 rounds) of .300BLK ammunition. Manufacturer's limited lifetime warranty. Will not fit on Colt lower receiver with sear blocks. Made in USA. Upper wt: 4.8 lbs. Caliber: .300 AAC Blackout; 380 rounds of 147-gr. FMJ, 20 rounds of 155-gr. BTHP.