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Complete 18″ Mark 12 AR Carbine Kit

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Build a Complete 18″ MARK 12 Barrel, AR Carbine Kit

This kit contains everything you need to build your own AR except the stripped lower receiver.

The Kit Contains:

  • Fully assembled 18″ MARK 12 5.56 mm Upper with 15″ Keymod Palm Handguard®
  • MBA-3 Adjustable Carbine Buttstock Assembly (Black)
  • 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.

Complete description below.

$544.99

Build a Complete 18″ MARK 12 5.56 mm Barrel, AR Carbine Kit

This kit contains everything you need to build your own AR except the stripped lower receiver.

The Kit Contains:

  • Fully assembled 18″ MARK 12 5.56 mmUpper with 15″ Keymod Palm Handguard®
  • MBA-3 Adjustable Carbine 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:

  • MBA-3 Adjustable Carbine Buttstock Assembly
  • LRPK-1 Complete .223/5.56 Lower Receiver Parts Kit

18″ Mark 12 5.56 mm Complete Upper Barrel Assembly

Includes:

  • HG-V-15K – Palm Handguard® – Vented 15″ KeyMod with Barrel Nut
  • BAA3-M12 – 18″ Mark12 5.56 mm Barrel
  • FTT-EA1 – A3 Upper Receiver Assembled
  • BC-A-223 – Fully Assembled Bolt Carrier
  • BL-04 – Standard Gas Tube
  • GB-LP750 – Gas Block .750
  • BL-06-A2 — A2 Flash Hider

Barrel Specs:

  • 18″ Mark 12 5.56 mm Barrel
  • 5.56 mm
  • 4140 Chrome Moly
  • Threaded Barrel — Thread Pitch 1/2 x 28
  • 1-9 RH Barrel Twist
  • 6 Lands and Groves
  • M4 Feed Ramp
  • Button Broached

SKU: RKM12-18-3

Available Colors

Black

Buttstock Type

MBA-3

Application

AR15, Carbine

Caliber

.556 mm

Slot Style

KeyMod

Lands and Grooves

6

Material

8620 Steel, heat treated to 15N-89-91

Thread Pitch

1/2 x 28

Threaded

Yes

Twist

1-9

UPC Code

812058030560

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.
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