CMMG Dissent MK4 300 Blackout 6.50", Left Side Charging Handle, Armor Black, Zeroed Linear Comp, 4.60" M-LOK Handguard, Picatinny End Plate, Fits AR-Platform 30B0E67AB

CMMG DISSENT Mk4 Upper — 300 Blackout, 6.50" Barrel — Left-Side Charging — Armor Black — ZEROED™ Linear Comp — 4.60" M-LOK® Handguard — Picatinny End Plate — AR-15 Platform — Model 30B0E67AB — UPC 810097509207 Build a compact, hard-hitting PCC/SBR with the CMMG DISSENT Mk4 6.50" 300 Blackout Upper in Armor Black. Purpose-engineered for maneuverability and modern ergonomics, this upper pairs a 6.50" 300 BLK barrel with a left-side charging handle, a blast-taming ZEROED™ Linear Comp, and a minimalist 4.60" free-float M-LOK® handguard. A Picatinny end plate extends accessory options, while the DISSENT architecture streamlines manipulations for fast, confident control on the range or in close quarters. Note: Listing describes the upper receiver assembly. See Included / Not Included below to confirm components for your specific package. Why Choose the DISSENT Mk4 6.5" 300 BLK Upper 300 Blackout versatility in a micro package: Run supersonic loads for defense or hunting and subsonic loads for suppressed use (where legal) — all from the 6.50" barrel optimized for compact builds. Left-side charging efficiency: Keep your firing hand anchored while you charge, clear, or perform press checks with the support hand — ideal behind cover or in tight interiors. ZEROED™ Linear Comp: Directs blast and concussion downrange, improving shooter comfort compared to side-venting brakes — a smart choice for short-barrel .300 BLK. 4.60" free-float M-LOK® handguard: Rigid, lightweight rail with M-LOK slots for lights, hand stops, and QD sling points without front-end bulk. Armor Black finish: Low-glare, durable coating stands up to hard training cycles and real-world weather. Picatinny end plate: Adds rear rail real estate for sling hardware and accessories, keeping the setup modular and mission-ready. Key Specs (At a Glance) Platform: AR-15 / CMMG DISSENT Mk4 upper receiver group Caliber: .300 AAC Blackout (300 BLK) Barrel Length: 6.50 inches Muzzle Device: CMMG ZEROED™ Linear Comp (installed) Handguard: 4.60" free-float M-LOK® aluminum Charging: Left-side charging handle Rear Interface: Picatinny end plate Finish/Color: Armor Black Model / SKU: 30B0E67AB UPC: 810097509207 Designed for Real-World Performance Short-barrel 300 BLK shines in CQB and vehicle roles, and this DISSENT upper is built to exploit that strength. The linear comp pushes pressure forward for a more pleasant shooting experience, especially indoors or around teammates. The free-float handguard maintains accuracy while offering just enough rail length for critical accessories and ergonomic indexing without unnecessary weight. Build Notes & Compatibility Lower receivers: Pairs with most mil-spec AR-15 lowers. Confirm your brace/stock and buffer system to comply with local laws and your intended configuration. BCG & charging handle: DISSENT uppers often use platform-specific charging solutions; follow CMMG guidance for bolt carrier group and charging compatibility. Magazines: Use quality AR-15 magazines designed for 300 BLK for best feeding across bullet profiles. Optics & sights: Flat-top upper accepts red dots, prisms, or LPVOs; the short handguard supports offset lights/sights as desired. Suppressed use: For subsonic loads with a suppressor (where legal), consider tuning (adjustable gas / buffer) for optimal reliability. Ideal Use Cases Home & personal defense: Compact OAL, soft-shooting subsonic options, and efficient blast management. Vehicle & low-profile roles: Short package with forward-directed concussion for confined environments. Training & classes: Side-charging ergonomics and M-LOK® real estate for modern sling/light setups. Hunting (where appropriate): Supersonic .300 BLK loads deliver solid terminal performance at close-to-mid ranges. What’s Included / Not Included Included (typical): CMMG DISSENT Mk4 Upper, 6.50" 300 BLK barrel ZEROED™ Linear Comp (installed) 4.60" Free-float M-LOK® handguard Left-side charging assembly (as configured by CMMG) Picatinny end plate Not Included (verify package): Bolt Carrier Group (BCG) Sights/optics, sling, lower receiver assembly, magazines Always check the exact contents of your shipment; configurations may vary by retailer or batch. Setup & Zeroing Tips Verify safe/clear on your lower; separate upper/lower per AR procedures. Pin the upper to your AR-15 lower and install the recommended BCG/charging solution. Torque & threadlocker: Follow manufacturer specs for mounts and accessories. Function test with your intended ammo (supersonic/subsonic). Zero at your preferred distance (25–50 yards common for PDW builds); record dope for both load types. Care & Maintenance Keep the chamber, bore, and gas path clean; lube per BCG manufacturer recommendations. Re-check handguard and muzzle device torque after first 100–200 rounds. Suppressed shooting increases fouling — shorten cleaning intervals accordingly. Safety & Compliance Use only quality .300 AAC Blackout ammunition from reputable manufacturers. Follow all federal, state, and local laws regarding barrel length, stocks/braces, suppressors, and transport. Confirm headspace and component compatibility when installing your BCG. SEO-Friendly Highlights (Popular Search Terms) CMMG DISSENT Mk4 upper, 6.5" 300 Blackout side-charging upper, Armor Black AR-15 upper, ZEROED Linear Comp, 4.60" M-LOK handguard, Picatinny end plate, compact 300 BLK AR upper, 30B0E67AB, UPC 810097509207. Compact. Controllable. Configurable. The CMMG DISSENT Mk4 6.50" 300 Blackout Upper combines left-side charging, a ZEROED™ Linear Comp, and a free-float M-LOK® handguard to deliver a modern, maneuverable AR build with .300 BLK flexibility. "The End"