The Sanders Armory 12.5″ 6.5 Grendel II Upper Assembly Black Nitride is built for accuracy, durability, and consistent performance. This complete upper assembly is designed for hunters, competitive sport shooters, and firearm builders who require a reliable, range-ready solution.
At its core is a rugged 12.5″ 4150 CMV (Chrome Moly Vanadium) steel barrel finished in black nitride for corrosion and wear resistance. Each barrel is air-gauged for concentricity and features a single-point cut, 11° polished target crown for repeatable precision. The 1:8 twist rate and carbine-length stainless-steel gas system ensure smooth cycling and stable accuracy under sustained fire.
The assembly includes a premium forged AR-15/M16 Mil-Spec upper receiver with a spring-loaded dust cover and forward assist. A lightweight 10″ free-float slimline M-LOK handguard provides excellent heat dissipation and a modular mounting surface for optics or accessories. The muzzle device uses an industry-standard 5/8×24 thread pitch and ships with an A2-style flash suppressor to reduce muzzle flash and improve barrel control.
Our MPI-tested Mil-Spec 6.5 Grendel II bolt carrier group is purpose-engineered for the Grendel/R220 cartridge. The bolt head and steel extractor are specifically designed (not modified) for extended service life and reliable extraction. A Mil-Spec charging handle is included for dependable operation and ease of use.
Before shipping, every Sanders Armory upper assembly is inspected for fit, finish, and dimensional tolerance to meet our quality standards. The result is a professional-grade upper that’s ready to install and perform right out of the box. Upgrade your 12″ 6.5 Grendel II upper assembly with our Adjustable Gas Block by adding it to your cart and requesting installation at checkout.
SPECIFICATIONS:
- Brand: Sanders Armory
- Model: 12.5″ 6.5 Grendel II 4150 CMV (Chrome Moly Vanadium)
- Barrel Material: 4150 CMV (Chrome Moly Vanadium)
- Barrel Length: 12.5″
- Twist Rate: 1:8
- Barrel Finish: Black Nitride
- Barrel Profile: Medium-weight tapered / performance contour
- Barrel Testing: Air-gaged for concentricity
- Gas System: Carbine-length stainless steel gas tube
- Gas Block Seat: .750″ (low-profile steel gas block seat)
- Upper Receiver: AR-15/M16 Mil-Spec forged, forward assist, dust cover
- Handguard: 10″ free-float slimline M-LOK
- Bolt Carrier Group: MPI-tested Mil-Spec 6.5 Grendel II BCG (Black Nitride / QPQ where applicable)
- Bolt Head / Extractor: 6.5 Grendel-specific bolt head; steel extractor with reinforced geometry and protective coating
- Charging Handle: Mil-Spec included
- Muzzle Thread: 5/8×24 (industry standard) — A2 flash suppressor installed
- Compatibility: Standard AR-15 lower receivers; confirm lower spec and bolt carrier compatibility before installation
- Weight: 3 lbs 10 ounces
SHIPPING RESTRICTIONS:
No shipping to the District of Columbia (Washington, D.C.); Massachusetts; Connecticut; Chicago, Cook County, Deerfield, Highland Park, or Aurora (Illinois); New Jersey; New York; Puerto Rico; Hawaii; or Canada. No international shipping — shipments limited to the 48 contiguous United States. No APO/FPO/DPO addresses.
