STNGR 10.5 Inch 300BLK Complete Upper w/ 13.5 Inch HWKXL® Handguard, BCG & CH

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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

Products available on this page:

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

SWARM Warranty

STNGR USA products are warranted to the *original purchaser against any defects in materials and workmanship for the lifetime of the product. STNGR USA has sole discretion to determine manufacturer’s defects. The Swarm Warranty policy does not cover loss or theft. Cosmetic damage or changes that leave the product still in a functional condition, damage from improper use or intentional damages are also not covered by the warranty and will not be accepted. Items that have been modified or in any way altered from the original condition are not covered by the Swarm Warranty.

Eyewear lenses are fully covered by a 1 year scratch warranty. If you scratch or damage your lenses within 1 year of purchasing, STNGR will send you up to 1 pair of replacement lenses. This warranty only applies to the original purchase and not subsequent replacements. You also qualify for **20% off replacement lenses for life. Email  to receive your discount code.

Eyewear Lost & Broken Replacement Discount

Sometimes life happens. If you ever break or lose your sunglasses, no matter the reason, you’re covered with a hefty discount. Shoot STNGR an email at and you’ll get you hooked up with an exclusive 30% discount on future replacements.


*The original purchaser may have purchased from any of the following sources: Directly from STNGR (stngrusa.com or stngredge.com) or from an authorized dealer, distributor, or retailer. The original purchaser may be asked to show proof of purchase.

**The 20% discount is subject to replacement lens availability.

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