American Tactical Milsport Upper Features The American Tactical Inc Milsport Upper pairs a 16 steel barrel chambered in .300 AAC Blackout with a Black Nitride finish that resists corrosion and holds up to repeated cycling without flaking or wearing thin. The 5/8x24 threaded muzzle accepts a wide range of aftermarket brakes flash hiders and suppressor mounts giving the owner the flexibility to tune recoil and muzzle rise to their own setup. A 15 M-LOK handguard runs the length of the barrel offering mounting points at every clock position for lights foregrips bipods and slings without needing a separate rail adapter. Polymer flip-up sights front and rear fold out of the way when an optic is mounted and pop back up instantly when a backup iron sight is needed. The upper ships complete with its bolt carrier group and charging handle so there is no separate parts purchase required before it can be installed on a stripped lower. That makes it a straightforward way to add a second caliber to an existing AR-15 platform letting one lower serve both a 5.56 and a .300 AAC Blackout upper without buying a whole new rifle. The steel construction throughout the barrel and bolt carrier group is built to handle the pressures of the .300 AAC Blackout cartridge in both supersonic and subsonic loadings. The American Tactical Inc Milsport Upper suits home builders hunters and suppressor shooters who want a dedicated .300 AAC Blackout upper on hand for sale at GrabAGun. American Tactical Milsport Upper Specifications Manufacturer: American Tactical Model: Milsport Upper Caliber: .300 AAC Blackout Barrel Length: 16 Barrel Material: Steel Barrel Finish: Black Nitride Handguard: 15 M-LOK Sights: Polymer Flip-Up Adjustable Thread Pattern: 5/8x24 Special Feature: Threaded Barrel Includes Bolt/Charging Handle Color: Black Available At: GrabAGun