M.I.L.C. HiLo

3d printed milc 37mm

M.I.L.C. HiLo STL Files

DIY HiLo system utilizing an M14 bolt to chamber a 38 blank

Black Powder is So 1883

9 out of 10 launcher fans agree, black powder sucks. It corrodes barrels, you have to measure it out for every shot, and it stinks like you wouldn’t believe. The MILC system brings 37mm fun up to date by incorporating .38 Special blanks to create a clean and easy to use method of increasing your range time with your favorite launcher.

Shop Husky Armory

Whipped up by Methematics and AWCY?, this improvement on the humble black powder charge is easy to implement into any builder’s launcher kit.

Check out some compatible 37mm Launchers here: Anarchy 37mm Launcher, NT79 Launcher, B.A.L.L.S. Launcher

Of course, as with any launcher-related build, 3DGunBuilder recommends exercising extreme caution when beginning this project, as it requires handling dangerous materials. Keep all your fingers, life’s more fun that way

In The Wild



M.I.L.C. Technical Specs

The files are designed to accommodate PLA+ as a minimum. Documentation recommends specific print settings. Durability may vary depending on selected print settings and printing materials.

The MILC makes use of .38 Special blank rounds to create the pressure necessary to launch signals, abusing the pressure differential created by its signature burst tube design. This unique design allows for full, clean, and efficient burns of the smokeless powder in the blanks, which allow signaling at significantly higher speeds and smaller powder loads than what black powder allows.

M.I.L.C. Parts List


  • 1 – M14 x 30mm (or x 40mm) hex bolt (Grade 8)
  • 1 – M14 nut
  • 8 – M4 x 25mm screw
  • 1 – M8 x 8mm grab screw
  • 1 – 1 ½” 17ga. brass pipe


  • Hand drill / Drill press
  • Vice
  • Hand file / Grinder
  • ⅜ drill bit
  • ⁹⁄₃₂ drill bit
  • ¹⁵⁄₃₂ drill bit (½” also works)
  • ⁷⁄₆₄ drill bit (3mm also works)
  • M8 thread tap
  • Cutting fluid / PB-Blaster
  • Bucket of water
  • 80 grit sandpaper
  • Two-part epoxy
  • Metal saw

M.I.L.C. Build Instructions

The MILC system makes it easier to make your own 37mm fun, no black powder required. Download and build one today (carefully)!

Is something missing or incorrect?

DISCLAIMER: 3D STL files are for learning and documentation purposes only. The users of this website and files need to be aware of all applicable local, state, federal and regional laws. 3D Gun Builder does not encourage, condone, or promote any illegal activity.

3D Gun Builder (3dgunbuilder.com) does not host, provide, develop, and/or have any affiliation with the firearm STL files or 3dgunvault.com. All files are hosted by a third party.

Kem Regik
Latest posts by Kem Regik (see all)
3D Gun Files

Download over 100+ STLs


Learn 3D Gun Printing

Polymer 80

80% Guides & Tips

Industry News

Stay Up to Date

Suggest an Edit

If you see something incorrect or that we missed within this file, please let us know and we will fix it as soon as possible