The Diamondback DB15 DB1984B001 is a compact .300 Blackout AR-style pistol from the DB15 series that blends a short-barrel platform with service-grade components for home defense, suppressed shooting, and close-quarters range work, and it requires FFL transfer for purchase. This 10.5-inch 1:8 RH heavy 4150 CrMoV barrel with black nitride treatment and a pistol-length gas system is optimized for reliable cycling with both supersonic and subsonic .300 BLK loads, while the DB Obsidian 5/8-24 muzzle brake helps tame recoil and muzzle rise for faster follow-up shots. Built on forged 7075 T6 A3 flattop upper and forged 7075 lower housings with a Magpul MOE K2 grip and MOE enhanced trigger guard, the DB15 delivers a familiar AR ergonomics and durability; the shot-peened, MP-inspected Mil-Spec 8620 carrier bolt carrier group ensures longevity under high round counts. The 9-inch M-LOK anti-rotation S-Rail with full Picatinny and QD mounts accepts optics and accessories for duty-style setups, and the SB Tactical SBA5 brace provides stable cheek weld and control in a compact package. With a standard Mil-Spec trigger, Magpul-friendly magazine compatibility for 30-round pattern PMAGs, and a 6.25 lb weight, this semi-auto pistol suits tactical training, suppressed range sessions, and short-range hunting where maneuverability and .300 Blackout ballistics matter.