STNGR 12.5″ 5.56 Complete Upper – Carbine Length Gas with 13.5″ RPTR M-LOK Handguard & BCG
Built to Order – Ships Within 3 Business Days
Features
- 12.5″ 5.56 NATO barrel with 1:7 twist and carbine-length gas system
- 13.5″ STNGR RPTR free-float M-LOK handguard with anti-rotation tabs
- Billet upper receiver with forward assist and dust cover installed
- Low-profile .750 steel gas block with carbine-length gas tube
- Premium phosphate M16 BCG with 9310 MPI bolt and forged charging handle included
- KAK flash can to direct blast forward
- Compatible with mil-spec AR-15 lower receivers
This STNGR 12.5″ complete upper is configured for compact AR-15 pistol or SBR builds using a carbine-length gas system for reliable cycling in shorter barrel setups. The 1:7 twist 5.56 NATO chamber handles both 5.56 NATO and .223 Rem ammunition, making it a flexible option for training or defensive use. The 13.5″ RPTR M-LOK handguard provides extended rail space and a rigid lock-up with integrated anti-rotation tabs that interface cleanly with the billet upper receiver.
Disclaimer: Some components may vary from the images shown due to manufacturer updates or availability. All substitutions maintain the same performance standards and overall quality.
Specifications
- Brand: STNGR
- Model: 12.5″ Complete Upper with 13.5″ RPTR Handguard
- Fit: AR-15
- Caliber: 5.56 NATO
- Barrel Length: 12.5 inches
- Twist Rate: 1:7
- Gas System: Carbine-length
- Gas Block Diameter: .750
- Barrel Material: 4150 Alloy Steel
- Barrel Finish: Black Nitride
- Handguard Length: 13.5 inches
- Handguard Type: Free-float M-LOK
- Upper Receiver: Billet, Type III Hardcoat Anodized or Cerakote (depending on variant)
- Bolt Carrier Group: M16 profile, 8620 carrier with 9310 MPI bolt, phosphate finish
- Charging Handle: Forged AR-15 charging handle
- Muzzle Device: KAK Flash Can (1/2×28)
- Overall Weight: 3.5 pounds
- Finish Options: Type III Hardcoat Anodized or Cerakote
What’s Included
- 1x Billet Upper Receiver (assembled)
- 1x 12.5″ 5.56 NATO Barrel
- 1x 13.5″ STNGR RPTR M-LOK Handguard
- 1x Low-Profile .750 Gas Block
- 1x Carbine-Length Gas Tube
- 1x KAK Flash Can
- 1x Premium Phosphate M16 Bolt Carrier Group
- 1x Forged AR-15 Charging Handle
BACKED FOR LIFE
STNGR proudly stands behind their products with the SWARM Lifetime Warranty. If you have any issues happen that aren’t caused by normal use, they’ll send you a replacement – for free. It’s that simple. You also get free returns and exchanges for 60 days.
Read the full warranty here.
ADDITIONAL RESOURCES
Have more questions like “What is is difference between the HWK, RPTR and VYPR handguards?”. Check out STNGR’s FAQ here.
Products available on this page:
- STNGR 12.5 Inch 5.56 Complete Assembled Upper w/ 13.5 Inch RPTR® Handguard, BCG & CH - Black - Color: Black | SKU: STNGR-CU-P-RPTR-13-0
- STNGR 12.5 Inch 5.56 Complete Assembled Upper w/ 13.5 Inch RPTR® Handguard, BCG & CH - Flat Dark Earth - Color: Flat Dark Earth | SKU: STNGR-CU-P-RPTR-13-0-FDE
- STNGR 12.5 Inch 5.56 Complete Assembled Upper w/ 13.5 Inch RPTR® Handguard, BCG & CH - OD Green - Color: OD Green | SKU: STNGR-CU-P-RPTR-13-0-ODG
