Moriarti Arms AR-45 .45 ACP 16" M-LOK Complete Rifle Kit – Heavy Buffer, Non-LRBHO

AR-45 Rifle Kit: What's Included

Moriarti Arms presents the AR-45 .45 ACP 16" M-LOK Complete Rifle Kit. This blowback-style rifle is built to work with Glock-style lower receivers and comes with everything you need to complete your build except for the lower receiver. Designed for enthusiasts who demand durability, performance, and reliability, this kit features mil-spec components and is proudly Made in the USA. The 80% lower receiver can be purchased separately.

AR-45 Rifle Kit Features:

• Barrel:

  • Length: 16"
  • Material: 4150 CMV (Chrome Moly Vanadium)
  • Finish: Black Nitride
  • Chamber: .45 ACP
  • Twist Rate: 1:16
  • Muzzle Threads: 5/8-24
  • Integrated Feed Ramp
  • Muzzle Device: A2 Flash Hider (designed for .45 ACP)

• Upper Receiver:

  • Type: AR-15 flat top mil-spec upper
  • Design: Slim with no forward assist and no dust cover
  • Material: Billet Aluminum
  • Gas System: Blowback (optimized for .45 ACP)

• Handguards:

  • Type: Free-floating 15" slim M-LOK rail
  • Material: Aircraft-grade aluminum with black hardcoat anodized finish for enhanced durability

• Bolt Carrier Group (BCG):

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

• Charging Handle:

  • Type: 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

• Stock Assembly:

  • Type: Mil-Spec 6-position LE stock
  • Includes:
    • AR-45 heavy buffer for maximum performance
    • Buffer tube
    • Carbine spring for optimal cycling

Additional Notes:

• The kit comes unassembled and requires an 80% lower receiver, which is sold separately.
• This kit is optimized for Glock factory magazines for best performance.
• Handguard Design: The handguard design may vary slightly depending on stock availability but will maintain the same high-quality construction.
• Images: Product images may not represent the exact product, as slight variations may exist.

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.

Related: AR-45 parts kits · pistol caliber carbines