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  • RKB-18-1
  • RKB-18-3

Build a Complete 18″ Fluted Bull Barrel AR

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Build a Complete 18″ .223 Rem Fluted Bull Barrel, AR Kit. This kit contains everything you need to build your own AR except the stripped lower receiver.

The Kit Contains:

  • Fully assembled 18″ .223 Rem Fluted Bull Barrel Upper with 15″ Keymod Palm Handguard™
  • Your choice of either an MBA-1 Buttstock Assembly or MBA-3 Buttstock Assembly (Black)
  • Complete Lower Parts Kit
  • Complete description is listed below.

Add to your build with optional add-on parts such as a Velocity Drop-in trigger, or The Lower Enhanc-AR™ Kit.

Choose from the options below, then Review Configuration and Add to the cart.

Build a Complete 18″ .223 Rem Fluted Bull Barrel, AR Kit. This kit contains everything you need to build your own AR except the stripped lower receiver.

The Kit Contains:

  • Fully assembled 18″ .223 Rem Fluted Bull Barrel Upper with 15″ Keymod Palm Handguard™
  • Your choice of either an MBA-1 Buttstock Assembly or MBA-3 Buttstock Assembly
  • Complete Lower Parts Kit

Add to your build with optional add-on parts such as a Velocity Drop-in trigger, or The Lower Enhanc-AR™ Kit.

This Kit does not come with the lower receiver. You will have to supply a lower receiver purchased elsewhere. We recommend that you look for a Mil-Spec stripped lower.

Includes:

  • Your choice: MBA-1 Fixed Rifle Buttstock assembly or MBA-3 Adjustable Carbine Buttstock Assembly
  • LLRPK-1 Complete .223/5.56 Lower Receiver Parts Kit

Assembled Complete 18″ Fluted Bull Barrel Upper:

  • HG-V-15K – Palm Handguard – Vented 15″ KeyMod with Barrel Nut
  • BL-B18FT – 18″ .223 Rem, Bull Barrel, Fluted, Threaded 416 SST
  • FTT-EA1 – A3 Upper Receiver Assembled
  • BC-A-223 – Fully Assembled Bolt Carrier – .223
  • BL-04 – Rifle Length Gas Tube
  • GB-LP936 – Gas Block .936
  • BL-06-A2 — A2 Flash Hider

Barrel Specs:

  • 18″ .223 Rem Fluted Bull Barrel
  • .223 Rem
  • 416 SS
  • Threaded Barrel — Thread Pitch 1/2 x 28
  • Gas Block Diameter .936
  • Gas Tube Length — Rifle
  • 1-9 RH Barrel Twist
  • 6 Lands and Groves
  • M4 Feed Ramp
  • Button Broached
Shipping Weight 10 lbs
Shipping Dimensions 18 × 12 × 6 in
Application

Carbine, Rifle

Buttstock Type

MBA-1, MBA-3

Available Colors

Black

Slot Style

KeyMod

Caliber

.223 Rem

Material

Stainless Steel

Twist

1-9

Lands and Grooves

6

Threaded

Yes

Thread Pitch

1/2 x 28

Weight lbs

10

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.