ATI MilSport RIA .300 AAC Blackout | 16″ Barrel | 30rd

The American Tactical / ATI MilSport RIA is an AR-style semiautomatic carbine chambered in .300 AAC Blackout with a 16-inch threaded barrel and a 1:8 rate of twist. It ships with a 15-inch M-LOK handguard, an A2-style pistol grip, a 30-round magazine, and a matte black finish. The flat-top receiver and Picatinny rail offer straightforward optic mounting for a wide range of practical setups; a compact red-dot or low-power variable optic such as a Vortex SPARC AR or a similar sub-$1000 optic pairs well for close- to mid-range use.

Typical applications for this platform include short- to mid-range hunting and general-range/practical shooting where the .300 Blackout round’s ballistics and subsonic/supersonic flexibility are useful.

Product Specifications

• The UPC is 810113110288.
• The caliber is .300 AAC Blackout.
• The barrel measures 16 inches and is threaded.
• The barrel finish is Black Nitride.
• The rate of twist is 1:8.
• The handguard is a 15-inch M-LOK free-floating style.
• The rifle ships with a 30-round detachable magazine and one magazine included.
• The receiver is a flat-top Picatinny rail for optics and accessories.
• The action is Semi-Auto.
• The finish is Matte Black.
• The stock material is Synthetic with a Black finish.
• The grip type is a A2 pistol grip.
• The NFA thread pattern is 5/8×24.
• The ATF type is listed as a Modern Sporting Rifle.
• The manufacturer part number is ATIG15MS300ML15.

This MilSport RIA is a straightforward, no-nonsense AR platform built to deliver the known performance of the .300 AAC Blackout in a familiar AR chassis. The 15-inch M-LOK handguard provides ample attachment space while the flat-top receiver simplifies optic mounting for red dots or low-power variable optics. Whether used for hunting at shorter ranges or for precision-oriented range sessions, the rifle’s feature set supports a variety of practical uses without unnecessary complexity.