The Combat Armory CA-15 Rifle in 300 Blackout (brand part no. CA15.15SR.300R10) is a Mil-Spec AR-15 built from billet 7075-T6 aluminum upper and lower receivers, hard-coat anodized black for lasting durability. Combat Armory equips every CA-15 with Mil-Spec internals throughout, pairing a chrome-moly-vanadium barrel with a slim free-float M-LOK handguard for a lightweight, reliable rifle-length package. Among AR rifles, the CA-15 gives 300 Blackout shooters a straightforward, no-frills platform for the range, home defense, or a subsonic-capable hunting build.

Key Specifications

• The chambering is 300 Blackout.
• The barrel length is 16 inches.
• The barrel material is 4140 chrome-moly-vanadium steel for strength under sustained fire.
• The barrel finish is Melonite, adding corrosion and wear resistance to the bore.
• The barrel profile is M4 with M4 feed ramps for reliable feeding.
• The gas system is carbine length with a 0.750-inch low-profile gas block.
• The muzzle device is an A2 flash hider threaded 1/2×28.
• The upper and lower receivers are billet 7075-T6 aluminum with Type III hard-coat anodizing.
• The handguard is a 15-inch free-float M-LOK slim rail.
• It ships with a 10-round magazine compatible with 5.56/.223 magazine bodies.

Frequently Asked Questions

What twist rate does this barrel use? The CA-15 300 Blackout uses a 1:7 twist rate, suited to a wide range of bullet weights in this caliber.

What magazines does it use? It ships with one 10-round magazine and accepts standard 5.56/.223-pattern AR-15 magazines, which also feed 300 Blackout.

Is this rifle Mil-Spec? Yes, every major component, from the bolt carrier group and fire control group to the charging handle and buffer tube, is built to Mil-Spec dimensions.

Buy the Combat Armory CA-15 300 Blackout Rifle

A Mil-Spec 300 Blackout AR-15 with a corrosion-resistant Melonite barrel and slim M-LOK handguard is exactly what the CA-15 delivers. Order from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.