Moriarti Armaments AR-45 .45 ACP 7.5" M-LOK Complete Pistol Kit (Heavy Buffer, Non-LRBHO)

AR-45 Pistol Kit: What's Included

Moriarti Armaments proudly presents an introductory kit for building your AR-45 .45 ACP pistol with an 7.5" barrel. This kit comes with everything you need to complete your AR-45 build, except for the lower receiver, which can be purchased separately. All components are made in the USA and designed to meet Mil-Spec standards for performance and reliability.

AR-45 Pistol Kit Features:

• Barrel: 7.5" .45 ACP Match Grade AR Barrel

  • Material: 4150 Chrome Moly Vanadium Steel
  • Finish: Black Nitride
  • Chambered: .45 ACP
  • Twist: 1:16
  • Muzzle Threads: 5/8x24
  • Muzzle Device: A2 Flash Hider (designed for .45 ACP)
  • Design: Blowback
  • Length: 7.5"

• Upper Receiver: AR-15 flat top billet upper

  • Type: Slick side, no forward assist or dust cover
  • Design: Blowback-dedicated

• Gas System: Blowback design

• Handguard: Free-floating 7" Slim M-LOK rail

  • Made from aircraft-grade aluminum and black hardcoat anodized for durability and performance

• Bolt Carrier Group (BCG):

  • Material: US-made 8620 steel with a mag phosphate finish
  • Precision-milled for use with Glock-style or traditional AR-45 lower receivers
  • Cut: M-16 cut for compatibility with transferable full-auto MGs (BATFE rules apply)

• Charging Handle: Mil-Spec Standard AR-15 charging handle

• Lower Parts Kit: Complete Standard Mil-Spec AR-15 parts kit with a standard trigger group to complete your lower build

• Pistol Tube Assembly:

  • Includes foam and AR-45 heavy buffer for maximum performance and carbine spring compatibility

Additional Notes:

• This kit comes unassembled.
• Lower receiver is not included but can be purchased separately.
• Additional options and modifications to your kit are available at the top of the page.

Images may not be an exact representation of the product.

FAQ

Is a lower receiver included?

No. The kit ships without a lower receiver, so you complete it on your own pistol-caliber lower.

What lower does it fit?

A dedicated pistol-caliber AR lower that takes Glock-style .45 ACP magazines. A standard AR-15 lower with 5.56 magazines will not feed it.

How does it operate?

It is a direct blowback pistol-caliber design with no gas tube or gas block, so a heavy PCC buffer is used for reliable cycling.

Does the bolt lock back on empty?

No. This is a non-LRBHO setup, so the bolt does not hold open after the last round.

Why use a heavy buffer in a PCC?

Blowback pistol-caliber ARs have no gas system to slow the bolt, so a heavier buffer reduces bolt bounce, wear and felt recoil.

Can I put a stock on this pistol build?

Adding a shoulder stock to a build with a barrel under 16" makes it a short-barreled rifle under the NFA. Do it only in compliance with federal and state rules.

Related: AR-45 parts kits · pistol caliber carbines