The CMMG Dissent BR4 (brand part no. 55A520BMB) is a rifle-length take on the Dissent line, chambered in 5.56x45mm, one of the most popular calibers on the market. The 16.10-inch black nitride threaded barrel sits inside an aluminum receiver finished in Midnight Bronze Cerakote, with a full-length Picatinny rail and M-LOK handguard ready for optics and accessories. An adjustable gas block lets shooters dial in the system for suppressed use or their preferred ammunition, while the Magpul fixed stock keeps the rifle simple and dependable. It’s built for shooters who want Dissent-family features in a standard rifle configuration.

Key Specifications

• Chambered in .223 Rem/5.56 NATO, one of the most popular calibers for the platform.
• Built around a 16.10-inch barrel rifled with a 1:7 twist.
• Finished with a black nitride, threaded muzzle for durability and accessory mounting.
• Feeds from a 10+1 capacity, with two Magpul PMAG magazines included.
• Houses the action in an aluminum receiver with a full Picatinny top rail.
• Finished in Midnight Bronze Cerakote for a distinctive, durable look.
• Fitted with an M-LOK handguard for mounting optics, lights, and other accessories.
• Equipped with an adjustable gas block for tuning between suppressed and unsuppressed shooting.
• Uses a reversible crossbolt safety for either-handed operation.
• Rides on a Magpul fixed black polymer stock for a simple, dependable rifle setup.

Frequently Asked Questions

Can the gas system be tuned for a suppressor? Yes, the adjustable gas block lets you fine-tune the DISSENT to your preferred ammunition, suppressed or unsuppressed.

How many magazines are included? Two Magpul PMAG magazines ship with the rifle.

Is the safety selector ambidextrous? Yes, it uses a reversible crossbolt safety for either-handed shooters.

Buy the CMMG Dissent BR4 Rifle

Order the CMMG Dissent BR4 in 5.56mm from our Lubbock, Texas gun shop for fast, insured shipping to your local FFL. CMMG built the Dissent line for shooters who want modern AR features in a dependable package, part of our full semi-auto rifles lineup.