High Standard Ar-15/M16 Complete 300aac Upper Assembly

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Build or convert a rifle to run the 300 Blackout round with this complete upper assembly from High Standard. The A3 flat top upper is coupled with a 16″, parkerized barrel that has a 1-8 twist and is made from 4140 steel.Upper assembly also includes bolt carrier group, charging handle, low profile gas block, and CAR handguard. Mfg: High Standard SPECS: 16″, Parkerized, 4140steel, 1-8 twist barrel, Low profile gas block, Bolt carrier group, Charging handle