DPMS DPM4-FSB M4 AR-15 Rifle 5.56 NATO 16"
Mil-spec DPMS M4 carbine in 5.56 NATO with nitride-coated barrel, forged 7075-T6 upper and lower, full-auto bolt carrier group, and Magpul MBUS rear sight. Classic AR platform ready to shoot.
DPMS DPM4-FSB M4 Carbine: American-Made Reliability
The DPMS DPM4-FSB represents the modern evolution of the M4 platform—a rifle built to mil-spec standards and proven in the field. This is a straightforward, no-nonsense carbine designed for shooters who understand that reliability matters.
Barrel and Gas System
The 16-inch nitride-coated Chrome Moly Vanadium barrel features a 1/7" twist rate optimized for modern 5.56 NATO ammunition. The M4 barrel extension and carbine-length gas system deliver the balance of velocity and handling that makes the M4 platform so effective. The F-marked front sight base serves double duty as your gas block, a time-tested design that has proven itself across decades of military service.
Upper and Lower Receivers
Both upper and lower receivers are forged from 7075-T6 aluminum and machined to MIL-SPEC tolerances, then hard coat anodized for durability. The upper includes a forward assist and dust cover—essentials for any serious rifle. The lower is marked "MULTI" for caliber flexibility and fitted with a mil-spec diameter buffer tube with six adjustment positions and an M4-style stock.
Bolt Carrier Group
This rifle features a full-auto profile bolt carrier group with a shot-peened Carpenter No. 158 steel bolt. The gas key is hardened to USGI specifications and secured with Grade 8 screws, then staked per mil-spec—the kind of attention to detail that separates quality builds from the rest.
Trigger and Controls
The single-stage fire control group uses a DPMS mil-spec trigger assembly. An A2-style grip and M4-style stock provide familiar ergonomics. The M4 handguard with heat shields protects your support hand during sustained fire.
Sights and Accessories
The rifle ships with a Magpul MBUS rear sight in black, giving you a backup aiming system that's proven in competition and duty use. The A2 flash hider helps manage muzzle signature.
Specifications at a Glance
- Caliber: 5.56 NATO
- Barrel Length: 16 inches
- Overall Length: 32 inches
- Weight: 6.8 lbs
- Muzzle Thread: 1/2" x 28
This is a rifle for shooters who know what they want: a mil-spec M4 carbine that works. No frills, no compromises.
