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Luth-AR .223 Bull Rifle Kit Minus Lower Receiver w/Fixed Stock Up to 12% Off w/ Free Shipping — 4 models

Luth-AR Bull Rifle Kit Minus Lower Receiver w/Fixed Stock, .223, 26in, 16in, Bull, Carbine, 1x9, 1/2x28, Picatinny, Key MOD, A2 Flash Hider, Anodized, Manganese Phosphate, Silver/ Black, RKB-16-1
Luth-AR Bull Rifle Kit Minus Lower Receiver w/Fixed Stock, .223, 29in, 20in, Bull, Rifle, 1x9, 1/2x28, Picatinny, Key MOD, A2 Flash Hider, Anodized, Manganese Phosphate, Silver/ Black, RKB-20-1
Luth-AR Bull Rifle Kit Minus Lower Receiver w/Fixed Stock, .223, 27in, 18in, Bull, Rifle, 1x9, 1/2x28, Picatinny, Key MOD, A2 Flash Hider, Anodized, Manganese Phosphate, Silver/ Black, RKB-18-1
Luth-AR Bull Rifle Kit Minus Lower Receiver w/Fixed Stock, .223, 31in, 24in, Bull, Rifle, 1x9, 1/2x28, Picatinny, Key MOD, A2 Flash Hider, Anodized, Manganese Phosphate, Silver/ Black, RKB-24-1
Luth-AR Bull Rifle Kit Minus Lower Receiver w/Fixed Stock, .223, 26in, 16in, Bull, Carbine, 1x9, 1/2x28, Picatinny, Key MOD, A2 Flash Hider, Anodized, Manganese Phosphate, Silver/ Black, RKB-16-1
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Luth-AR Bull Rifle Kit Minus Lower Receiver w/Fixed Stock, .223, 26in, 16in, Bull, Carbine, 1x9, 1/2x28, Picatinny, Key MOD, A2 Flash Hider, Anodized, Manganese Phosphate, Silver/ Black, RKB-16-1
Luth-AR Bull Rifle Kit Minus Lower Receiver w/Fixed Stock, .223, 29in, 20in, Bull, Rifle, 1x9, 1/2x28, Picatinny, Key MOD, A2 Flash Hider, Anodized, Manganese Phosphate, Silver/ Black, RKB-20-1
2 of 4 images
Luth-AR Bull Rifle Kit Minus Lower Receiver w/Fixed Stock, .223, 29in, 20in, Bull, Rifle, 1x9, 1/2x28, Picatinny, Key MOD, A2 Flash Hider, Anodized, Manganese Phosphate, Silver/ Black, RKB-20-1
Luth-AR Bull Rifle Kit Minus Lower Receiver w/Fixed Stock, .223, 27in, 18in, Bull, Rifle, 1x9, 1/2x28, Picatinny, Key MOD, A2 Flash Hider, Anodized, Manganese Phosphate, Silver/ Black, RKB-18-1
3 of 4 images
Luth-AR Bull Rifle Kit Minus Lower Receiver w/Fixed Stock, .223, 27in, 18in, Bull, Rifle, 1x9, 1/2x28, Picatinny, Key MOD, A2 Flash Hider, Anodized, Manganese Phosphate, Silver/ Black, RKB-18-1
Luth-AR Bull Rifle Kit Minus Lower Receiver w/Fixed Stock, .223, 31in, 24in, Bull, Rifle, 1x9, 1/2x28, Picatinny, Key MOD, A2 Flash Hider, Anodized, Manganese Phosphate, Silver/ Black, RKB-24-1
4 of 4 images
Luth-AR Bull Rifle Kit Minus Lower Receiver w/Fixed Stock, .223, 31in, 24in, Bull, Rifle, 1x9, 1/2x28, Picatinny, Key MOD, A2 Flash Hider, Anodized, Manganese Phosphate, Silver/ Black, RKB-24-1

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Questions & Answers
Is the barrel dimpled under the gas block for eady alignment of the gas tube allen set screw holes? Manufacturer Answer

The barrel is dimpled for the gas block set screws and is lined up and test fired from the factory.

by Luth-AR, Manufacturer, December 5, 2024
Will this also handle 5.56 Expert Answer

The Luth-AR .223 Bull Rifle Kit is chambered in .223, and would not be able to fire 5.56 safely. With a 5.56 stamped barrel, you can fire both 5.56 and .223 safely. A barrel chambered/stamped in .223, can only use .223.

by Ethan, Gear Expert, August 8, 2022
View All Q&A You Have a Question? Ask!
Customer Reviews
Most Recent Reviews
Luth AR 223 Bull barrel upper kit by Big Dog, Verified Owner, May 16, 2024
Wasn't expecting the quality and precision to be as good as it is! Yes they are newer to the rifle part of the game but nailed it on this one! Easily assembled with a little bit of common sense and knowledge! 100 yard groups are extremely tight and c...
Read More...
Read 1 Review
4 Models Available
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ATTENTION! We currently do not ship this product to P.O. Boxes, AK, CA, CT, DE, HI, MA, NJ, NY, U.S. Territories, or select Colorado locations. Please see our policies for more information or a detailed list of locations.

made-in-usa-flag Made in USA

Help support American manufacturing! Marked models of this product have gone through rigorous review and been certified by the manufacturer as Made in the USA.

Product Info for Luth-AR .223 Bull Rifle Kit Minus Lower Receiver w/Fixed Stock

The Luth-AR .223 Rem Fluted Bull Barrel Upper with 15in KeyMod Palm Handguard and Complete Lower Parts Kit comes with all the pieces you need to put together a formidable rifle build minus the stripped lower receiver. These AR15 Upper Receivers from Luth-AR are constructed from 416 stainless steel for a strong and lightweight platform to take on your next pursuit. This Luth-AR .223 Rem Bull Barrel Upper Rifle Kit Minus Lower Receiver w/Fixed Stock includes 6 lands and groves machined out of the barrel to allow easy chambering, and the M4 feed ramps ensure smooth operation with larger ammo. Put together a Luth-AR .223 Rem Fluted Bull Barrel Rifle Kit Minus Lower Receiver and Fixed Stock to create a dependable firearm for self-defense or target shooting applications.image

Specifications for Luth-AR .223 Bull Rifle Kit Minus Lower Receiver w/Fixed Stock:

Manufacturer: Luth-AR
Caliber: .223 Remington
Stock/Brace Material: 416 Stainless Steel
Barrel Profile: Bull
Barrel Twist Rate: 1-9
Number of Sling Points: 2
Firearms Threads Per Inch: 1/2x28
Handguard Type: Free-Float
Muzzle Device: A2 Flash Hider
Color: Silver, Black
Gun Model: AR-15
Fabric/Material: 416 Stainless Steel
Gas Block Journal Size-Diameter: .936 in
Handguard Length: 15 in
Handguard Style: Round Rail
Gun Rail: KeyMod
Gun Type: Rifle
Gun Make: AR Platform
Barrel Material: 416R Stainless Steel
Bolt Carrier Group Included: MIL-SPEC
Charging Handle Included: MIL-SPEC
Magazine Included: No
Additional Features: A2 Rifle Buffer Tube, Will need GT-CUP
Included Accessories: Lower Parts Kit, Stock Assembly Kit
Country of Origin: USA

Features of Luth-AR AR-15 Complete Fluted Bull Barrel Kit w/ Fixed Stock

  • .223 Rem Fluted Bull Barrel
  • 416 SS
  • Threaded Barrel - Thread Pitch 1/2 x 28
  • Gas Block Diameter .936
  • Gas Tube Length - Carbine
  • 1-9 RH Barrel Twist
  • 6 Lands and Groves
  • M4 Feed Ramp
  • Button Broached

Package Contents:

  • Luth-AR .223 Bull Rifle Kit Minus Lower Receiver w/Fixed Stock
  • .223 Rem Fluted Bull Barrel Upper with 15in Keymod Palm Handguard.
  • Buttstock Assembly (Black).
  • Complete Lower Parts Kit.

Luth-AR .223 Bull Rifle Kit Minus Lower Receiver w/Fixed Stock Orderable Models

List of Orderable Models

  • Luth-AR Bull Rifle Kit Minus Lower Receiver w/Fixed Stock, .223, 26in, 16in, Bull, Carbine, 1x9, 1/2x28, Picatinny, Key MOD, A2 Flash Hider, Anodized, Manganese Phosphate, Silver/ Black, RKB-16-1 , MPN: RKB-16-1 , UPC: 812058030454 , Code: 3FN-UFH-AR15C16223F-RKB-16-1
  • Luth-AR Bull Rifle Kit Minus Lower Receiver w/Fixed Stock, .223, 29in, 20in, Bull, Rifle, 1x9, 1/2x28, Picatinny, Key MOD, A2 Flash Hider, Anodized, Manganese Phosphate, Silver/ Black, RKB-20-1 , MPN: RKB-20-1 , UPC: 812058030492 , Code: 3FN-UFH-AR15C16223F-RKB-20-1
  • Luth-AR Bull Rifle Kit Minus Lower Receiver w/Fixed Stock, .223, 27in, 18in, Bull, Rifle, 1x9, 1/2x28, Picatinny, Key MOD, A2 Flash Hider, Anodized, Manganese Phosphate, Silver/ Black, RKB-18-1 , MPN: RKB-18-1 , UPC: 812058030478 , Code: 3FN-UFH-AR15C16223F-RKB-18-1
  • Luth-AR Bull Rifle Kit Minus Lower Receiver w/Fixed Stock, .223, 31in, 24in, Bull, Rifle, 1x9, 1/2x28, Picatinny, Key MOD, A2 Flash Hider, Anodized, Manganese Phosphate, Silver/ Black, RKB-24-1 , MPN: RKB-24-1 , UPC: 812058030515 , Code: 3FN-UFH-AR15C16223F-RKB-24-1
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Last updated 2026-07-25 UTC.