LMT Defense Custom .300BLK AR-Pistol Build

Posted: 08/26/2026

LMT Defense Custom .300BLK AR-Pistol Build

This custom LMT MARS-LS AR pistol combines a premium LMT lower with carefully selected components from several respected manufacturers. Chambered in .300 Blackout, the build centers around an 11.5-inch Noveske barrel and offers a compact, high-quality configuration with distinctive upgrades throughout.

The LMT MARS-LS lower receiver provides fully ambidextrous controls and an excellent foundation for the build. Meanwhile, the Noveske 11.5-inch barrel brings a highly regarded barrel manufacturer into the configuration. Together, these components create a strong foundation for a premium custom AR.

Additionally, the Daniel Defense MK18 rail provides a proven free-floating handguard with ample accessory mounting space. A LANTAC Dragon muzzle brake completes the muzzle configuration and gives the pistol an aggressive appearance. Furthermore, the Maxim Defense pistol brace maintains a compact profile while complementing the short-barreled setup.

An Aero Precision bolt carrier group handles the operating system. Likewise, a Timber Creek charging handle provides easy manipulation of the action. Finally, Magpul MBUS sights provide a lightweight backup sighting system.

Includes the LMT MARS-LS lower, 11.5″ Noveske barrel, Daniel Defense MK18 rail, LANTAC Dragon muzzle brake, Maxim Defense pistol brace, Aero BCG, Magpul MBUS sights, and Timber Creek charging handle.

This custom MARS-LS stands apart from a standard production AR through its combination of LMT, Noveske, Daniel Defense, LANTAC, Maxim Defense, and Aero Precision components. It offers an appealing package for someone specifically seeking a premium custom-built .300 Blackout pistol.

NO MAGAZINE INCLUDED.

Ships to FFL.

Specifications:

  • Action: Semi-automatic
  • Caliber: .300 AAC Blackout
  • Capacity: N/A
  • Barrel Length: 11.5 Inches
  • Finish: Black