The ATI Mil-Sport is a semi-automatic rifle chambered in .300 AAC Blackout (7.62x35mm), built on an AR-style platform with a black finish and a 16-inch barrel. At 8.6 lbs with a 30+1 capacity, it's set up for practical range use or field work. 
 

Key Specifications 

• Caliber: .300 AAC Blackout (7.62x35mm) 
• Barrel Length: 16 inches 
• Capacity: 30+1 rounds 
• Weight: 8.6 lbs 
• Action Type: Semi-Automatic 
• Finish: Black 
• Trigger Type: Standard 
• Grip Type: Standard 
• Stock Type: 6-position Rogers Super-Stoc 
• Sights: Picatinny Rail 
• Barrel Twist Rate: 1:8" 
   

Detailed Features 

The 16-inch barrel works well with both subsonic and supersonic .300 Blackout loads, and the 1:8" twist handles the range of bullet weights typically used in this cartridge. The six-position Rogers Super-Stoc adjusts length of pull so different shooters can get a consistent cheek weld and grip. 
 
The Picatinny rail on top leaves room for optics, lights, or a laser, standard AR flexibility. The standard trigger and grip are functional; most owners looking to refine the feel will have no shortage of drop-in options given how common the AR platform is. 
 

Usage 

The .300 AAC Blackout makes this rifle useful for hunting, suppressed shooting, and range work. The Mil-Sport is positioned as an entry-level option in the AR market, so it fits shooters getting into the platform without a large upfront investment.

Discussions around the ATI Mil-Sport in .300 AAC Blackout tend to land in a few consistent areas.

The .300 Blackout cartridge draws most of the praise. The ability to run both subsonic and supersonic loads out of the same rifle is a genuine advantage, particularly for suppressor users. Owners also mention the price as a positive: it's one of the more affordable ways into a .300 Blackout AR.

Build quality is where opinions diverge. Some owners find it solid and reliable; others feel certain components are noticeably cheaper than higher-end AR builds. Accuracy at the range tends to get positive marks when using quality ammunition, but there are occasional reports of feeding issues with certain magazine brands or budget ammo.

The AR platform means aftermarket parts and accessories are plentiful, which owners who like to customize appreciate. Weight and handling get generally favorable comments for extended sessions.

Customer support experiences with ATI vary. Some owners report straightforward resolution of issues, others less so. On balance, the Mil-Sport gets recommended as a budget-friendly entry into the .300 Blackout platform, with the understanding that component quality reflects the price point.