Brawler Build Kit

Brawler Build Kit Overview

The Brawler takes the proven Harlot platform and wraps it in a knuckle duster frame that’s equal parts functional firearm and conversation piece. This single-shot .22LR break-action derringer from Black Lotus Coalition delivers the same reliable operation as the original Harlot in a grip style that’s genuinely unique in the 3D printed firearms space.

This build kit includes the .22LR rifled barrel liner, springs, all mounting hardware, and a USB drive with print files. The Brawler shares the same fire control group and breech design as other Harlot variants—proven components with thousands of successful builds. Print the frame, assemble the kit, and you’ve got a working .22LR pistol that looks like nothing else on the range.

What Makes the Brawler Different

Distinctive Knuckle Duster Design
The Brawler’s four-finger grip frame isn’t just for aesthetics—it provides a secure, natural hold that keeps the pistol locked in your hand during firing. The grip geometry distributes recoil across your knuckles rather than your palm, creating a different shooting experience than traditional derringer designs.

Proven Harlot Internals
Under the unique exterior, the Brawler uses the same fire control group, breech design, and barrel system as other Harlot variants. This isn’t an experimental platform—it’s a proven .22LR action in a new package. The break-action design is simple, reliable, and easy to understand.

Beginner-Friendly Assembly
Like all Harlots, the Brawler was designed for accessibility. If you can operate a 3D printer and turn a screwdriver, you can build this pistol. No press-fitting, no drilling beyond basic deburring, no machining. The assembly process follows the same steps as the original Harlot—video tutorials apply directly.

BrassTax Option Included
The USB drive includes files for both the Brawler (printed) and BrassTax (brass) versions. The designs are identical—BrassTax simply uses brass material for the frame instead of printed plastic. Brass stock is not included in the kit, but the files are there if you want to machine your own metal version.

What’s in the Brawler Build Kit

Components
.22LR rifled barrel liner (requires chambering), hammer spring, and all necessary springs for the fire control group. These are the same proven components used across the Harlot family.

Hardware
M3 bolts in required lengths, M3 nuts, and hex key for assembly. Everything needed to complete the build except the UFA-required metal weight.

Files & Documentation
USB drive containing Brawler print files, BrassTax files, and assembly documentation. All STL files are properly oriented and scaled for printing.

Brawler Build Kit FAQ