The Alexander Arms Standard Rifle in .300 AAC Blackout (MPN R300ST) is a semi-automatic AR-15 finished in black, pairing a 16-inch barrel with a 1:7 twist rate suited to both subsonic and supersonic .300 Blackout loads. Alexander Arms mounts a Picatinny rail for optic flexibility and equips the rifle with a manual thumb safety. The rifle feeds from a detachable 30-round magazine and measures 39 inches overall. Among AR-platform rifles in the AR rifles category, the Standard Rifle favors shooters who want a straightforward, no-frills .300 Blackout AR-15.

Key Specifications

• Chambered in .300 AAC Blackout with a 1:7-inch twist rate.
• Features a 16-inch barrel.
• Finished in black.
• Mounts a Picatinny rail for optic flexibility.
• Includes a manual thumb safety.
• Operates as a semi-automatic rifle.
• Feeds from a detachable 30-round magazine.
• Overall length is 39 inches.

Frequently Asked Questions

What twist rate does this barrel use? A 1:7-inch twist, suited to both subsonic and supersonic .300 Blackout loads.

Does this rifle come with sights? It mounts a Picatinny rail, ready for the buyer’s choice of optic.

Buy the Alexander Arms Standard Rifle

A straightforward, no-frills .300 Blackout AR-15 is exactly what the Standard Rifle delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.