The Combat Armory CA-15 (brand part no. CA15.7FR.300P10) is a complete AR-15 pistol chambered in 300 Blackout, built on billet 7075-T6 upper and lower receivers with a 7.5-inch Melonite-finished barrel — a pairing that suits the cartridge, since 300 Blackout was designed to burn efficiently from short barrels. Combat Armory machines the barrel from 4140 chrome moly vanadium in an M4 profile with a 1:7 twist, runs a pistol-length gas system under a .750 low-profile gas block, and caps the 1/2×28 threads with an A2 flash hider. A free-floated 7-inch M-LOK handguard with a full-length Picatinny top rail, mil-spec fire control group, and pistol buffer tube round out the build, with a 10-round magazine included. Among AR pistols, this CA-15 favors shooters building toward suppressed 300 Blackout use.

Key Specifications

• The chambering is 300 Blackout, efficient from short barrels by design.
• The barrel measures 7.5 inches, 4140 CMV with a Melonite finish and M4 profile.
• The rate of twist is 1:7, stabilizing supersonic and subsonic loads.
• The muzzle is threaded 1/2×28 with an A2 flash hider installed.
• The gas system is pistol-length with a .750 low-profile gas block.
• The receivers are billet 7075-T6 with Type III hard-coat anodizing.
• The handguard is a free-floated 7-inch M-LOK rail with full Picatinny top.
• Ships with a pistol buffer tube and mil-spec fire control group.
• One 10-round magazine is included.

Frequently Asked Questions

Does this pistol come with a brace or stock? No, it ships with a bare pistol buffer tube. It is configured as a pistol — installing a shoulder stock on a firearm with a barrel under 16 inches requires NFA registration first.

Why choose 300 Blackout in this format? The cartridge was engineered for short barrels and suppressor use, losing far less performance from 7.5 inches than 5.56 does.

What magazines does it accept? Standard AR-15 magazines; a 10-round magazine is included.

Buy the Combat Armory CA-15 300 Blackout Pistol

A short-barrel-native cartridge in a billet-receiver pistol platform is exactly what this CA-15 delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.