CMMG MK4 Zeroed Banshee SD .300 BLK SBR 6.5" Integrally Suppressed Barrel - Black

CMMG MK4 Zeroed Banshee SD .300 BLK SBR 6.5" Integrally Suppressed Barrel - Black

Experience the ultimate in compact, whisper-quiet firepower with the CMMG® Suppressed ZEROED BANSHEE™ Mk4 SBR. Purpose-built to maximize the ballistic efficiency and signature reduction of the .300 AAC Blackout cartridge, this factory two-stamp Short-Barreled Rifle arrives as a complete, range-ready package engineered for elite home defense, tactical operations, and backcountry hunting. Pairing a 6.5-inch 4140 chrome moly barrel with a factory-included CMMG ZEROED 30 suppressor tucked seamlessly beneath an extended 11-inch handguard, this suppressed platform eliminates muzzle blast and delivers formidable terminal performance in a fast-handling, balanced footprint.

Built on CMMG’s proven Mk4 architecture, this rifle combines a precision-machined billet 6061-T6 upper with a forged 7075-T6 lower receiver, treated in a protective Cerakote finish. An oversized 1.72-inch inner-diameter M-LOK handguard shrouds the suppressor while remaining comfortable during high-volume strings thanks to three included silicone SD-style thermal covers. Optimized for both subsonic whisper loads and hard-hitting supersonic rounds, the direct-impingement system features a tunable .750-inch adjustable gas block, a crisp ZEROED single-stage drop-in trigger, full ambidextrous controls, and an ergonomic B5 Systems Bravo stock. Backed by CMMG’s Lifetime Quality Guarantee, the Suppressed ZEROED BANSHEE represents the pinnacle of turnkey suppressed carbines.

Features

Factory-Tucked Suppressed Configuration:
Pairs a 6.5-inch barrel with a full-size CMMG ZEROED 30 suppressor nested beneath an extended 11-inch handguard, providing maximum sound mitigation and a streamlined, snag-free profile right out of the box.

Oversized Handguard with Silicone SD Heat Covers:
Features an 11-inch M-LOK handguard boasting an expansive 1.72-inch internal diameter for suppressor clearance, bundled with three SD-style silicone thermal covers to shield hands from radiant heat during sustained fire.

Tunable .750″ Adjustable Gas System:
Equipped with a pistol-length gas system and a user-adjustable .750-inch gas block, allowing operators to dial in the perfect cyclic rate and gas pressure for flawless cycling across varying subsonic and supersonic .300 BLK loads.

Complete CMMG ZEROED™ Control Suite:
Outfitted from the factory with premium ZEROED ergonomic components, including an ambidextrous charging handle, 60/90-degree configurable ambi safety selector, enhanced trigger guard, and ergonomic pistol grip.

Crisp Single-Stage Drop-In Trigger:
Features a match-grade ZEROED drop-in single-stage trigger engineered with a short take-up, clean break, and tactile reset for lightning-fast follow-up shots and precision shot placement.

Billet & Forged Receiver Architecture:
Constructed with a CNC-machined Mk4 billet 6061-T6 aluminum upper and a duty-proven forged 7075-T6 aluminum lower receiver, finished in hard-wearing Cerakote for maximum protection against corrosion and abrasion.

B5 Systems Bravo Stock & FASTBACK Extension:
Anchored by a FASTBACK 6-position receiver extension and a B5 Systems Bravo collapsible stock, offering optimal cheek weld, sling integration, and swift length-of-pull adjustability.

Specifications