The Diamondback DB15 .338 ARC pistol (brand part no. DB1989Y001) is the Extended Line AR pistol that puts the .338 ARC cartridge in a 10.5-inch barrel and a brace-equipped package built for close to mid range work. Diamondback Firearms fits it with a pistol-length gas system and a Superlative Arms adjustable gas block, so the pistol can be tuned for supersonic or subsonic loads and is ready for a suppressor. A 9-inch M-LOK handguard, a Magpul MOE grip and an SB Tactical SBA5 brace finish the package, and a 26-round metal magazine comes in the box. It suits a shooter who wants a compact AR pistol with serious bullet weight behind it for hunting, range time or home defense.

Key Specifications

• Chambering is .338 ARC, a cartridge that carries heavy bullets in an AR-15 sized action.
• The barrel is 10.5 inches long with a 1:5 right-hand twist, a fast rate suited to heavy bullets.
• Barrel steel is medium-profile 4150 CrMoV with a black nitride finish for wear and corrosion resistance.
• The gas system is pistol length with a Superlative Arms adjustable gas block, which lets you tune the action to the load.
• The brace is an SB Tactical SBA5, mounted to the buffer tube so the pistol can be braced against the forearm.
• The handguard is a 9-inch M-LOK rail, giving you slots for lights, grips and other accessories.
• The muzzle carries a 5/8×24 thread protector, so a brake, flash hider or suppressor mount can go straight on.
• Controls include a Radian Talon ambidextrous safety, a Radian Raptor-LT ambidextrous charging handle, an extended bolt catch and Radian takedown pins.
• The magazine is a 26-round metal magazine, and the pistol also runs 6.5 Grendel, 400 Legend and 7.62x39mm magazines.
• The grip is a Magpul MOE unit, and the finish is black hardcoat anodize on forged 7075-T6 receivers.

Frequently Asked Questions

Is this a pistol or a rifle? It is a pistol. The DB15 .338 ARC has a 10.5-inch barrel and an SB Tactical SBA5 brace in place of a shoulder stock, and it measures 25.5 inches collapsed.

Can I use a suppressor on it? The pistol-length gas system uses a Superlative Arms adjustable gas block and Diamondback describes it as suppressor-ready from day one. The muzzle is threaded 5/8×24 and ships with a thread protector.

Which magazines does it run? It ships with a 26-round metal magazine. Diamondback states it also runs 6.5 Grendel, 400 Legend and 7.62x39mm magazines without proprietary parts.

Buy the Diamondback DB15 Pistol, .338 ARC, 10.5-Inch Barrel, SBA5 Brace, 26-Round

A 10.5-inch .338 ARC in a braced pistol format is a niche build, and this one comes complete with the grip, brace, adjustable gas and premium controls already fitted. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and browse more semi-auto rifles from the same shop while you are here.