The Alexander Arms Standard is a semi-automatic rifle chambered in .300 AAC Blackout, with a 16-inch barrel and a 33-inch overall length. At 6.54 lbs and 30+1 capacity, it's built for shooters who want the .300 BLK platform, particularly those running suppressors with subsonic loads. 
 

Key Specifications 

• Caliber: .300 AAC Blackout 
• Barrel Length: 16 inches 
• Capacity: 30+1 rounds 
• Weight: 6.54 lbs 
• Overall Length: 33 inches 
• Action Type: Semi-Auto 
• Finish Color: Black 
• Safety Mechanism: Manual Thumb Safety 
• Stock Type: Adaptive Tactical EFX (Synthetic) 
• Sights Type: Picatinny Rail 
   

Detailed Features 

 
Alexander Arms has been building .300 Blackout rifles since the cartridge's early commercial days. They have more accumulated platform-specific experience than most AR manufacturers. The Picatinny rail system along the top gives direct access for optics mounting without additional adapters. The Adaptive Tactical EFX synthetic stock is adjustable for length of pull. Standard AR-pattern controls throughout. The 16-inch barrel works with both supersonic and subsonic .300 BLK loads; if you plan to run a suppressor, the subsonic performance of this platform is a primary draw.

Owners of the Alexander Arms Blackout tend to speak highly of its accuracy and reliability across subsonic and supersonic .300 BLK loads. Build quality feedback is generally positive, with users noting solid materials and consistent fit. The rifle's suitability for suppressed subsonic shooting comes up frequently, particularly from hunters and shooters in situations where noise reduction matters. Customization with optics, lights, and suppressors is well-supported by the Picatinny rail and standard AR compatibility.

Price is the most common criticism. Alexander Arms products sit at a premium compared to mass-market .300 BLK ARs, and some buyers weigh whether that premium is justified for their specific needs. Customer service experience varies in user reports, with some positive interactions and some complaints about response times. Ammunition availability for .300 BLK has improved considerably as the cartridge grew in popularity, which is now less of a concern than it was in earlier years.