CMMG Dissent BR4 300 AAC Blackout 14.5in 10+1

The CMMG Dissent BR4 300 AAC Blackout 14.5in 10+1 is a purpose-built ranch and utility rifle that ditches the frills and gets straight to work. Chambered in .300 AAC Blackout, it pairs a compact, reliable AR-style platform with a coyote tan Cerakote finish that shrugs off weather and hard use. The 14.50-inch black nitride threaded barrel, capped with a pinned and welded P&W CMMG Zeroed SVD muzzle brake, keeps the overall length legal without a tax stamp while still taming recoil for quick follow-up shots. Two Magpul 10-round PMAGs come in the box, and the Magpul SGA synthetic stock gives you a solid, no-slip cheek weld whether you’re in the saddle or behind a truck tailgate.

Key Features

• Pinned and Welded Muzzle Brake: The CMMG Zeroed SVD brake is permanently attached to the 14.5-inch barrel, bringing overall length to 16 inches so you skip the NFA wait and still get a compact rifle that handles brush and cab work.
• 300 AAC Blackout Chambering: This round gives you the punch of a .30-caliber in a short barrel, cycling supersonic and subsonic loads without a hiccup — perfect for taking coyotes or dropping a hog at close range without blowing out your ears.
• Magpul SGA Stock: The SGA synthetic stock adjusts for length of pull and comb height, so you get a custom fit whether you’re wearing a heavy coat or a light shirt. It’s tough, lightweight, and won’t crack in cold weather.
• Coyote Tan Cerakote Finish: This isn’t just for looks — the Cerakote resists rust, scratches, and the kind of mud and dust you kick up on a daily ranch run. It stays functional even when you don’t have time to baby your gear.
• Two Magpul 10-Round PMAGs Included: You get two reliable, drop-free magazines right out of the box. No hunting for extras, no cheap plastic that fails in the field.

Who It’s For

This rifle is for the rancher, the rural worker, or the utility shooter who needs a dependable tool for predator control, varmint dispatch, and property defense. It’s not a safe queen — it’s a get-it-done gun that rides in a truck rack or hangs on a saddle scabbard without complaint. If you value reliability over flash, this is your rifle.

Pros and Cons

• Pros: Compact 14.5-inch barrel with pinned brake avoids NFA paperwork; .300 Blackout handles both supersonic and subsonic ammo; Cerakote finish stands up to weather; Magpul stock and mags are proven tough.
• Cons: The pinned and welded brake means you can’t swap muzzle devices without gunsmith work — if you plan to suppress, you’ll need to factor in a dedicated suppressor mount or a different barrel setup.

Comparison

FAQ

• ✓ Nationwide delivery (all 50 states)
• ✓ Ships 1-2 business days
• ✓ 30-day returns
• ✓ Secure checkout

Last updated: April 2026

Explore more in our AR Rifles collection, or check out .300 Blackout Ammunition and AR Parts to complete your setup.