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11.5″ Lightweight Complete Upper Barrel Receiver Assembly

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The Luth-AR 11.5″ Lightweight Complete Upper Barrel Assembly starts with our 11.5″, 5.56mm Lightweight barrel made from 4150 Chrome Molly with a 1-9″ twist mated to our A3 Flattop receiver which includes our bolt carrier, charging handle, forward assist and ejection port cover. The upper is then topped off with our lo-profile gas system and our ergonomic  9″ Palm Handguard® with KeyMod slots and a Picatinny top-rail.

*Note all NFA requirements apply.

11.5″ Lightweight Complete Upper Barrel Assembly


  • HG-V-9K – Palm Handguard® – Vented 9″ KeyMod with Barrel Nut
  • BL-L11 – 11.5″ Lightweight Barrel
  • FTT-EA1 – A3 Upper Receiver Assembled
  • BC-A-223 – Fully Assembled Bolt Carrier – .223/5.56mm
  • BL-04A – Carbine Gas Tube
  • GB-LP750 – Gas Block .750
  • UR-19 — Charging Handle
  • BL-06-A2 — A2 Flash Hider

Barrel Specs:

Lightweight 11.5″ Barrel

  • Available in 11.5″
  • 5.56 mm
  • 4150 Chrome Moly
  • Threaded Barrel — Thread Pitch 1/2 x 28
  • Gas Block Diameter .750
  • Gas Tube Length — Carbine
  • 1-9 RH Barrel Twist
  • 6 Lands and Groves
  • M4 Feed Ramp
  • Button Broached

*All NFA requirements must be followed


Shipping Weight 6 lbs
Shipping Dimensions 24 × 8 × 8 in

A3 Flattop



Feed Ramp


Slot Style


Lands and Grooves


Thread Pitch

1/2 x 28




4150 Chrome Molly



UPC Code


For best results we recommend following a break-in procedure. We recommend that you clean the chamber and bore after every round for the first 25 rounds. It should take approximately 200 rounds for optimum barrel accuracy. Please keep in mind that accuracy is dependent upon many factors such as bullet weight, powder load, etc. If you have any question regarding our procedure, please ask or give us a call.
Per ammunition guidelines it is not recommended to shoot 5.56mm in a .223 REM  barrel, which we support for best and safest use of our product.