STNGR 10.5″ 300 BLK Complete Upper with 13.5″ HWKXL® Suppressor-Ready Handguard, BCG & CH
This complete upper from STNGR delivers a purpose-built 300 BLK platform for shooters who want maximum versatility in a compact package. The 10.5-inch barrel is the sweet spot for 300 BLK—whether you’re running supersonic loads for hunting and home defense or subsonic rounds with a suppressor for quiet work. This is the foundation for suppressor hosts, hunting rifles, and close-quarters setups where you need hard-hitting performance without the length. The 13.5-inch HWKXL handguard extends past the muzzle for that clean, tucked look—perfect if you’re planning to add a suppressor down the line.
The AT3 10.5-inch medium profile barrel in 300 BLK pairs with a pistol-length gas system for reliable cycling with both supersonic and subsonic ammunition. The STNGR HWKXL handguard is built from 6061-T6 aluminum with M-LOK slots at 3, 6, and 9 o’clock, plus QD sling points front and rear. At just 8.7 ounces, it keeps the weight down while giving you a full-length top rail and plenty of room to mount lights, lasers, and grips. The KAK 5-inch extended flash can gives you extra length to fill the handguard and redirect concussion forward.
This upper comes fully assembled and ready to run—STNGR includes their phosphate chrome-lined M16 bolt carrier group with a C158 bolt and a standard GI charging handle. Built on AT3’s slick side billet upper receiver with a low-profile .750 steel gas block and pistol-length stainless gas tube. Available in Black, Flat Dark Earth, and OD Green to match your build.
Features
- 10.5-inch medium profile barrel with pistol-length gas system for reliable cycling with supersonic and subsonic loads
- 13.5-inch STNGR HWKXL handguard with suppressor-ready design for tucked muzzle devices
- M-LOK slots at 3, 6, and 9 o’clock with QD sling points front and rear
- Full-length top Picatinny rail for optics and accessories
- STNGR phosphate chrome-lined BCG with C158 bolt and standard GI charging handle included
- Slick side billet upper receiver for clean lines
- KAK 5-inch extended flash can redirects muzzle blast forward
- Available in Black, Flat Dark Earth, and OD Green
Specifications
- Brand: STNGR
- Model: 10.5 Inch 300BLK Complete Upper w/ 13.5 Inch HWKXL® Handguard, BCG & CH
- MPN: STNGR-CU-P-HWKXL-105-BLK-300
- Caliber: 300 BLK
- Barrel Length: 10.5 inches
- Barrel Profile: Medium
- Gas System: Pistol-length
- Handguard Length: 13.5 inches (actual 13.75 inches)
- Handguard Type: M-LOK free-float
- Handguard Material: 6061-T6 Aluminum
- Handguard Weight: 8.7 ounces
- Inside Diameter: 1.75 inches
- Upper Receiver: Slick side billet
- Gas Block: .750 low-profile steel
- Bolt Carrier Group: STNGR phosphate chrome-lined M16 with C158 bolt
- Charging Handle: Standard GI
- Muzzle Device: KAK 5-inch extended flash can (5/8×24 thread)
- Color Options:
- Black – Type 3 Hardcoat Anodized
- Flat Dark Earth – H-267 Cerakote Magpul® Flat Dark Earth
- OD Green – H-232 Cerakote Magpul® OD Green
What’s Included – Installed
- 1x Assembled Upper Receiver
- 1x 13.5″ STNGR HWKXL M-LOK Handguard
- 1x 10.5″ AT3 300 BLK Medium Profile Barrel
- 1x KAK 5″ Extended Flash Can
- 1x 5/8″ Crush Washer
- 1x Pistol-Length Gas Tube
- 1x Low-Profile Gas Block
- 1x STNGR Phosphate Chrome-Lined BCG
- 1x Standard GI Charging Handle
Products available on this page:
- STNGR 10.5 Inch 300BLK Complete Upper w/ 13.5 Inch HWKXL® Handguard, BCG & CH - Black - Color: Black | SKU: STNGR-CU-P-HWKXL-105-BLK-300
- STNGR 10.5 Inch 300BLK Complete Upper w/ 13.5 Inch HWKXL® Handguard, BCG & CH - Flat Dark Earth - Color: Flat Dark Earth | SKU: STNGR-CU-P-HWKXL-105-FDE-300
- STNGR 10.5 Inch 300BLK Complete Upper w/ 13.5 Inch HWKXL® Handguard, BCG & CH - OD Green - Color: OD Green | SKU: STNGR-CU-P-HWKXL-105-ODG-300
