Moriarti Arms .45 ACP 4.5" Barrel Blowback AR-45 Pistol Kit - Slick Side Upper, M-LOK, Non-LRBHO

Build Kits

Moriarti Arms .45 ACP 4.5" Barrel Blowback AR-45 Pistol Kit - Slick Side Upper, M-LOK, Non-LRBHO

Build your AR-45 pistol with this Moriarti Arms 4.5" Barrel Blowback Kit. Designed for Glock-style lowers, this complete upper kit features a slick side upper, blowback gas system, and M-LOK handguard. Ideal for enthusiasts looking for a compact build with reliable performance, this kit comes with everything needed for assembly except the lower receiver. Lower receiver sold separately.

Kit Features:

• Barrel: 4.5" .45 ACP Match Grade AR Barrel

  • Material: 4150 Chrome Moly Vanadium Steel
  • Finish: Black Nitride
  • Chambered: .45 ACP
  • Twist Rate: 1:16
  • Muzzle Threads: 5/8-24
  • Muzzle Device: A2 Flash Hider (designed for .45 ACP)
  • Gas System: Blowback

• Upper Receiver:

  • Type: AR-15 flat top billet upper, slick side (no forward assist, no dust cover)
  • Design: Blowback-dedicated

• Handguard:

  • Type: Free-floating 4" Slim M-LOK rail
  • Made from aircraft-grade aluminum and black hardcoat anodized for superior durability and performance

• Bolt Carrier Group (BCG):

  • Material: US-made 8620 steel with a mag phosphate finish
  • Compatibility: 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, 7.5 oz heavy buffer for maximum performance, and carbine spring

Additional Notes:

• This kit comes unassembled and requires a lower receiver, which is sold separately.
• The kit is designed for optimal performance when used with Glock factory magazines.
• Handguard Variations: The handguard design may differ based on stock availability, but it will maintain the same high quality.
• Images may not represent the exact product, as slight variations may exist.