CMMG Banshee MK3 8.6 Blackout Upper – 16.10" Armor Black Cerakote, AR-10 / Mk3 – 33BFA0C-AB (UPC: 810148629038)
Turn your AR-10–pattern lower into a hard-hitting, modern big-bore with the CMMG Banshee MK3 8.6 Blackout 16.10" Black Armor Cerakote Receiver for AR-Platform – part number 33BFA0C-AB, UPC 810148629038. This complete upper group is built on CMMG’s Mk3 (AR-10–style) platform and features a 16.1" 4140 chrome moly vanadium barrel, 1:3 twist, 5/8x24 threads, and a factory-installed CMMG ZEROED™ 8.6 BLK muzzle brake, all finished in durable Armor Black Cerakote. Ready Gunner+3OpticsPlanet+3OpticsPlanet+3
If you’ve been looking to explore the 8.6 Blackout cartridge—famous for its versatility in subsonic suppressed builds and hard-hitting supersonic performance—this upper gives you a turnkey solution that drops right onto a compatible Mk3 / AR-10 lower. OpticsPlanet+2OpticsPlanet+2
Purpose-Built 8.6 Blackout Upper for the AR-10 / Mk3 Platform
This CMMG upper is engineered specifically around the Mk3 (AR-10–pattern) platform, giving you a solid foundation for a reliable 8.6 BLK build:
Mk3 / AR-10–style upper receiver designed to mate with CMMG Mk3 lowers and compatible AR-10 pattern lower receivers. OpticsPlanet+2Elk River Guns+2
Turns your existing .308-sized lower into a dedicated 8.6 Blackout rifle with no need to buy a full new gun.
Ideal for hunters, precision shooters, and suppressed rifle enthusiasts who want more energy and bigger bullets than traditional 5.56 or .300 BLK.
Simply pin this upper onto a compatible lower, add your preferred optic, and you’re ready to run 8.6 BLK.
16.10" 8.6 Blackout Barrel – 1:3 Twist for Heavy Bullets
At the heart of this upper is a barrel designed from the ground up for 8.6 Blackout performance:
Caliber: 8.6mm Blackout (8.6 BLK). OpticsPlanet
Barrel length: 16.1 inches – the sweet spot for maximizing velocity while keeping the platform handy and legal as a standard rifle barrel. OpticsPlanet+1
Twist rate: 1:3" twist, optimized to stabilize heavy, long 8.6 BLK projectiles, especially subsonic loads. OpticsPlanet+1
Material: 4140 chrome moly vanadium steel barrel, chosen for strength, barrel life, and consistent accuracy. OpticsPlanet+1
Threads: 5/8x24 muzzle threads, standard for many .30-cal and large-bore muzzle devices and suppressors. OpticsPlanet+1
CMMG’s own description of 8.6 BLK highlights its versatility for suppressed subsonic use and serious terminal performance with supersonic ammo, and this barrel is tuned specifically to make the most of that capability. OpticsPlanet+1
ZEROED™ 8.6 BLK Muzzle Brake – Ready for Suppressor or Recoil Reduction
Factory-installed at the muzzle is the CMMG ZEROED™ Muzzle Brake for 8.6 BLK:
Helps reduce felt recoil and muzzle movement, keeping the rifle more controllable for follow-up shots. OpticsPlanet+1
5/8x24 threads make it straightforward to swap to a suppressor or different muzzle device if desired. OpticsPlanet+1
Designed to complement the upper’s overall Armor Black Cerakote finish. OpticsPlanet+1
Whether you’re shooting unsuppressed at the range or running a can in the field, you start with a quality muzzle device right out of the box.
Armor Black Cerakote Receiver – Tough, Clean, and Modern
This upper group is finished in Armor Black Cerakote, giving it both protection and a sleek aesthetic:
Cerakote Armor Black finish resists corrosion, scratches, and hard use better than basic anodizing alone. OpticsPlanet+2Classic Firearms+2
Matches well with most black or dark AR-10 lowers and accessories for a clean, cohesive look.
Built on a Mk3 upper receiver engineered to handle the extra bolt thrust and overall dimensions of the 8.6 BLK / .308-size platform. OpticsPlanet+1
If you’re building a serious working rifle or a sleek, modern hunting rig, Armor Black Cerakote gives you both durability and style.
Includes ZEROED™ Ambi Charging Handle & Polymer Dust Cover
This isn’t just a stripped upper—it’s a feature-complete upper group with CMMG’s ZEROED components installed:
ZEROED Mk3 polymer dust cover – lightweight and corrosion-resistant. OpticsPlanet+1
ZEROED AR10/Mk3 ambidextrous charging handle – makes it easy to run the rifle from either side, ideal for left-handed shooters and modern manipulation techniques. OpticsPlanet+1
ZEROED 8.6 BLK muzzle brake (as noted above). OpticsPlanet+1
Because these ZEROED parts are included from the factory, you save time and money compared to sourcing upgraded charging handles and dust covers separately.
Free-Float M-LOK Handguard (Typical Build) – Accessory Ready
Many retail listings of this upper group show it paired with a free-floating M-LOK rail, similar to CMMG’s Resolute uppers in 8.6 BLK:
Free-float M-LOK handguard helps preserve accuracy by avoiding direct contact with the barrel. Palmetto State Armory+1
M-LOK slots give you attachment points for lights, lasers, bipods, grips, and hand stops without adding excessive bulk. Palmetto State Armory
Carbine-length gas system and low-profile gas block (on comparable 16.1" 8.6 BLK uppers) are tuned for reliable cycling in this caliber. Palmetto State Armory+1
Specific rail styles can vary by configuration and vendor, but the AR-10 free-float M-LOK format is common across this SKU.
Why 8.6 Blackout? Big-Bore Versatility in an AR-10 Upper
The 8.6 BLK cartridge was created as a larger sibling to .300 Blackout, optimized for both subsonic and supersonic roles:
Excellent for suppressed shooting with heavy subsonic bullets, taking advantage of the 1:3 twist to stabilize very long projectiles. OpticsPlanet+1
Supersonic loads can deliver substantial energy on target for medium to large game at practical hunting distances. OpticsPlanet+1
AR-10–based platform gives you a strong, familiar semi-auto system with available mags and parts. Gun Deals+1
If you want a cartridge that bridges the gap between traditional .308 Win rifles and specialized subsonic builds, 8.6 BLK is a compelling option—and this CMMG upper is one of the most straightforward ways to get into it.
Ideal Uses for the CMMG Banshee MK3 8.6 BLK Upper
This 16.10" 8.6 BLK Mk3 upper is a solid choice for:
Hunting: Ideal for hogs, deer, and similar game with appropriate supersonic loads. Buds Gun Shop+1
Suppressed rifles: Pair with a compatible suppressor for ultra-quiet subsonic shooting (where legal). OpticsPlanet+1
Tactical / patrol-style rifles: Big-bore performance in a semi-auto AR-10 implementation for capable barrier and terminal ballistics.
Range and steel: Unique recoil impulse and bullet profile make it a fun and challenging cartridge to run on steel and paper.
Because it’s an upper assembly only, you can configure your lower with your preferred stock, trigger, and buffer system to match the role you have in mind.
Key Specifications – CMMG Banshee MK3 8.6 Blackout Upper 33BFA0C-AB
Why Choose the CMMG Banshee MK3 8.6 Blackout 16.10" Upper (33BFA0C-AB)?
Choose the CMMG Banshee MK3 8.6Blackout 16.10" Black Armor Cerakote Receiver for AR-Platform – 33BFA0C-AB (UPC 810148629038) if you want:
A ready-to-run 8.6 BLK upper for your AR-10 / Mk3 lower with CMMG ZEROED upgrades already installed.
A 16.1" 4140 CMV barrel with 1:3 twist and 5/8x24 threads, tuned for heavy subsonic and powerful supersonic loads.
A durable Armor Black Cerakote finish on a Mk3 receiver that matches high-end AR builds.
A straightforward path into the versatile 8.6 Blackout cartridge, whether for hunting, suppressed shooting, or just building a unique big-bore AR.
Drop this upper onto a compatible lower, mount your optic, and you’ve got a modern, powerful 8.6 BLK setup built on trusted CMMG engineering.
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