Dpms Firearms M4 5.56 16 Fsb W/Rear Mbus

The DPMS M4 5.56 16" with front sight base and rear MBUS is a straightforward, reliable AR-15 carbine built on mil-spec components and designed for shooters who want a no-frills platform for hunting, sport shooting, or training. This is a complete, ready-to-run rifle that balances proven functionality with practical ergonomics—no guessing about compatibility or quality.

Under the hood, you're looking at a forged 7075-T6 upper receiver (hard-coat anodized to mil-spec) paired with a matching lower in the same aluminum alloy. The 16-inch Chrome Moly barrel wears a phosphate finish and feeds through a carbine-length gas system; the 1-in-7 twist handles modern 5.56 ammunition across the full weight spectrum. Up front, an F-marked front sight base does double duty as your gas block, crowned with a standard A2 flash hider (1/2x28 threads). The bolt carrier group runs a full-auto profile with a shot-peened Carpenter 158 steel bolt, properly staked and fastened per USGI spec—the kind of details that separate rifles built to last from ones that cut corners.

The lower houses a Panther Polished single-stage trigger, mil-spec buffer tube with six positions, and a standard M4 carbine stock. The M4 handguard includes heat shields to keep your hand comfortable during sustained fire. You get backup iron sights right out of the box: a Magpul MBUS rear sight in black, which pairs well with the front sight base for a clean, cowitness setup. Overall length runs 32 inches, and the rifle weighs 6.8 pounds—handy enough for a truck gun or a day in the field, substantial enough to shoot straight.

This is the kind of rifle that doesn't demand much explanation. It's mil-spec where it matters, American-made upper receiver, and ready to go to work.

Key Features

• Forged 7075-T6 upper and lower receivers, hard-coat anodized to mil-spec standards
• 16-inch Chrome Moly barrel, phosphate finished, with carbine-length gas system and 1-in-7 twist
• F-marked front sight base serves as gas block; A2 flash hider at muzzle
• Full-auto profile bolt carrier group with shot-peened Carpenter 158 steel bolt
• M4 handguard with heat shields for comfortable handling
• Magpul MBUS rear backup iron sight included
• Panther Polished single-stage trigger
• Six-position mil-spec buffer tube with M4 carbine stock
• 32-inch overall length; 6.8 lbs as configured

Specifications

Caliber	5.56 NATO
Barrel Length	16 inches
Barrel Material	Chrome Moly Vanadium
Barrel Finish	Phosphate
Twist Rate	1 in 7
Gas System	Carbine length
Muzzle Thread Pattern	1/2 x 28
Muzzle Device	A2 flash hider
Gas Block	F-marked front sight base
Upper Receiver	Forged 7075-T6, hard-coat anodized, A3 type with forward assist and dust cover
Lower Receiver	Forged 7075-T6, hard-coat anodized, marked MULTI
Bolt Carrier Group	Full-auto profile; Carpenter 158 steel bolt, shot-peened; hardened gas key staked per mil-spec
Trigger	Panther Polished single-stage (PPT)
Handguard	M4 with heat shields
Grip	A2-style
Stock	M4 carbine stock
Buffer Tube	Mil-spec diameter, hard-coat anodized, 6 adjustment positions
Rear Sight	Magpul MBUS, black
Overall Length	32 inches
Weight	6.8 lbs

Frequently Asked Questions

What backup sights come with this M4 rifle?

A Magpul MBUS rear iron sight in black is included. Combined with the F-marked front sight base, you get a cowitness setup ready to use right out of the box.

Is this rifle compatible with standard AR-15 parts and magazines?

Yes. The lower receiver is marked MULTI for caliber compatibility within the 5.56 NATO platform, and it uses mil-spec dimensions throughout, so it works with standard AR-15 components and 5.56 NATO magazines.

Can I mount a suppressor or other muzzle device on this carbine?

The barrel is threaded 1/2x28, which is the standard for 5.56 rifles. The A2 flash hider can be swapped for a suppressor or other muzzle device of your choice.

What kind of shooting is this rifle suited for?

The 16-inch barrel, carbine-length gas system, and mil-spec components make this a practical choice for hunting, sport shooting, training, or general-purpose use. The 1-in-7 twist stabilizes modern 5.56 ammunition across a wide range of bullet weights.