The DPMS DPM4 (brand part no. DP51655239601) is a mil-spec-minded AR-15 chambered in 5.56 NATO, built around a 16-inch M4-profile barrel in 4150V chrome-moly vanadium steel with a nitride finish and 1:7 twist. DPMS free-floats the barrel inside a 13.5-inch M-LOK handguard over a carbine-length gas system and low-profile gas block, and builds the bolt carrier group right: shot-peened Carpenter 158 bolt, 8620 steel full-auto-profile carrier, and a properly staked gas key. Forged 7075-T6 receivers, a 6-position M4 stock, and a 30-round magazine complete the package at 7 pounds. Among AR rifles, the DPM4 favors shooters who want mil-spec construction details at an entry-level price.

Key Specifications

• The chambering is 5.56 NATO, which also fires .223 Remington.
• The barrel measures 16 inches, M4-profile 4150V chrome-moly vanadium steel with a nitride finish.
• The rate of twist is 1:7, stabilizing heavier 5.56 loads.
• The gas system is carbine-length with a low-profile .750-inch gas block.
• The handguard is a 13.5-inch DPMS M-LOK free-float rail, behind an A2 flash hider on threaded muzzle.
• The bolt is shot-peened Carpenter 158 steel in an 8620 full-auto-profile carrier with a staked gas key.
• Both receivers are forged 7075-T6 aluminum, hardcoat anodized, with forward assist and dust cover.
• The stock is a 6-position collapsible M4 style on a mil-spec 7075-T6 buffer tube.
• Ships with one 30-round magazine where legal.
• The overall length is 32 inches, weighing 7 pounds.

Frequently Asked Questions

Is the barrel free-floated? Yes, the 13.5-inch M-LOK handguard free-floats the barrel for better accuracy potential.

What bolt materials does it use? A shot-peened Carpenter 158 steel bolt in an 8620 steel M16-profile carrier, with the gas key staked to mil-spec.

Does it come with a magazine? Yes, one 30-round magazine is included where allowed by law.

Buy the DPMS DPM4 AR-15 Rifle

Mil-spec bolt materials, a free-floated nitride barrel, and M-LOK real estate at a working price are exactly what the DPM4 delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.