CMMG Dissent Mk4 Pistol, .300 Blackout, 14.5-Inch, Armor Black

The CMMG Dissent Mk4 pistol in .300 AAC Blackout with a 14.5-inch barrel and an Armor Black finish (brand part no. 30ACB0FAB) gives shooters enough barrel to extract .300 Blackout’s full performance without unnecessary length. CMMG pins and welds a ZEROED SVD brake to the muzzle, bringing the legal length to 16.1 inches so a folding stock can be added later without triggering NFA short-barreled-rifle rules. The direct-impingement system runs through an adjustable gas block, letting shooters dial in supersonic or subsonic .300 Blackout loads, and a reversible side charging handle cycles the action from either side. The rear 1913 Picatinny rail end cap accepts a sling, folding stock, or pistol brace separately. Among AR pistols built for close-quarters or mid-range use, this 14.5-inch Dissent configuration favors shooters who want full .300 Blackout performance in the shortest legal package.

Key Specifications

• Chambered in .300 AAC Blackout, this pistol runs a 30-round capacity magazine.
• The barrel measures 14.5 inches.
• A ZEROED SVD brake is pinned and welded to the muzzle, bringing the legal length to 16.1 inches.
• An adjustable gas block tunes the system for supersonic or subsonic loads.
• The operating system is direct impingement, run through CMMG’s buffer-less Compact Action.
• The charging handle is a reversible side charger.
• The rear 1913 Picatinny rail end cap accepts a sling, folding stock, or brace separately.
• The pistol ships with two 30-round Magpul PMAGs.

Frequently Asked Questions

Why is the muzzle brake pinned and welded? It brings the barrel’s legal length to 16.1 inches, so a folding stock can be added later without needing NFA registration.

Does this pistol include a brace or stock? No, the rear Picatinny rail end cap accepts a sling, folding stock, or brace, purchased separately.

Can the gas system be adjusted? Yes, an adjustable gas block tunes the Dissent for supersonic or subsonic .300 Blackout loads.

Buy the CMMG Dissent Mk4 Pistol, .300 Blackout, 14.5-Inch

A pinned-and-welded brake and an adjustable gas block make this 14.5-inch Dissent a versatile, future-proofed .300 Blackout platform. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.