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. https://youtu.be/BgioBUdg1Ec

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 (1/2x28)
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