Want to take a shortcut? Don’t collect and assemble every part your next AR-15 upper assembly requires. Just order the whole shebang by Luth-AR and proceed to step two!

This upper assembly features Luth-AR’s signature Heavy Barrel, with a strong, steady profile that promotes greater stability, absorbs more recoil, and benefits overall accuracy. Its fractional twist is exactly that: 1:8.5”, which adds sufficient stability to multiple weight classes of bullets. An optimal choice of barrel for precision shooting.

This assembly also features the Palm Handguard: a free-float tube with a comfortable triangular profile, with M-LOK slots and cuts that help dissipate heat and reduce weight (and look nice). A3 flattop receiver, bolt carrier, charging handle, forward assist, ejection port cover, low-profile gas system, and Picatinny top rail also included.

Includes:
Palm Handguard (vented 15″ M-LOK slots with barrel nut)
20″ 1:8-1/2 fractional twist Heavy Barrel (416 SS)
A3 upper receiver (assembled)
Fully assembled bolt carrier (.223)
Rifle-length gas tube
.936 gas block
Charging handle
A2 flash hider

Barrel Specs:
Length: 20″
Metal: 416 stainless steel
Thread pitch: 1/2x28
Gas block diameter .936
Gas port diameter: .097-.098″
Twist: 1:8-1/2” RH
Lands/grooves: 6
Feed ramp: M4
Button broached

Upper Specs:
7075-T6 aluminum
Hard coat anodize (black)

Bolt Specs:
Bolt: Carpenter 158 steel
Extractor: 4140 alloy steel
Army spec heat treatment
Manganese phosphate

Bolt Carrier Specs:
Carrier: 8620 steel
Cam pin: 4340 alloy steel
Carrier key: 4130 alloy steel
Army spec heat treatment
Manganese phosphate