mp22k sd carbine

MP22(K/SD/Carbine) STL Files

3D printed semi-auto .22 MP5(K/SD/Carbine)

MP22(K/SD/Carbine) Details

If the KF5’s MP5 parts kit was a bit too pricey for your tastes, don’t worry the boys at GCI have you covered with the newly released MP22(K/SD/Carbine).

This MP5 variant includes all of the files needed in a variety of formats for the MP22K, MP22SD, and MP22 Carbine.

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If you are not a fan of .22lr you may want to consider the pros of building out the MP22 which includes maximum LARP, ammo cost savings, and more design options.

Since the MP22(K/SD/Carbine) is chambered in .22 more of the firearm is able to be printed making for some seriously cool builds and with the final price tag coming in under $170 there is no excuse not to build this 3D printed MP5.

MP22(K/SD/Carbine) in the Wild



MP22(K/SD/Carbine) Tech Specs

The MP22k utilized “hardware store” metal components with the rest being 3D printed.

The file package includes .3mf, .dxs, STEP files, and other community-made add-ons making this .22 MP5 one of the most customizable 3D guns to hit the scene.

The build guide is extremely detailed and includes step-by-step instructions to get your MP22 running and range-ready with minimal swearing.

Required Parts for the MP22(K/SD/Carbine)


  • Filament
  • 3D Printer


You will need the following hardware depending on your MP5 style variant for the MP22(K/SD/Carbine). All of the materials can be found at a hardware store and online:

1 – m1.5 x 10mm screw (front sight post)

1 or 2 – m3 x 20mm pins (charging handle arm)

2 – m3 x 18mm screws (barrel block with ramp)

3 – m3 x 32mm screws (barrel retainer)

1 – m3 x 8mm screw (fasten ejector block to magwell)

2 – m4 x 10mm screws for front handguard screws

1 – m4 x 35mm screw for bottom hole in handguard

1 – m4 x 35mm screw (retract brace button)

2 – m5 nuts (rear sight)

2 – m5 x 14mm (rear sight)

2 – m5 x 16mm screws (rear sight)

1 – 5mm ID spring (rear sight)

1 – 6mm x 300mm linear rod (bolt guide rod)

1 – 6mm x 12mm x 19mm Linear Bearings

2 – 5mm x 38mm pins (endcap)

2 – 5mm x 34mm pins (upper pin and magwell)

2 – #138 Ace hardware springs- 2 1/2L x 21/64 OD x .028 WG (recoil spring) – full length springs

1 – m6 washer

2 – 1/4” rods 230mm length(retract brace arms)

1 – AK spring (or similar OD) piece (retract button)

1 – Barrel liner ~100mm

1 – 2oz Lead Sinkers

1 – AR15 FCG and fcg pins (5/32” rods cut to length would be a better option than factory fcg pins)

2 – 1.5mm rods for push safety or spring and detent for HK style safety

1 – 1/8” x 42mm rod (mag catch)

1 – nasal spray spring (or similar spring) for mag catch

1 – blackdog machine or cmmg spring for magazine

1 – bolt metal parts (made or purchased from SCS)

1 – extractor- 1/8″ or 3mm flatbar

1 – ejector- 16ga or 1.5mm

1 – bolt face plate- 18ga or 1.2mm

1 – extractor and ejector pins- 3mm or 1/8″ rod (27mm long for ejector)

1 – 5mm OD spring for extractor cut to ~5-8mm depending on strength of spring

1 – firing pin – 16ga or 1.5mm with 5mm OD spring cut to ~18mm


  • Hand drill
  • 1/16” drill bit
  • 1/8” drill bit
  • 1/4” drill bit
  • 15/64” drill bit
  • Files
  • Two-part epoxy
  • Kinetic sand
  • Propane torch

Suggested 3D Printed MP22(K/SD/Carbine) Settings

The slicer settings are fairly standard for 3D guns but you should also use what you know works best for your printer. As this is a .22 variant the danger of “blowing up” is greatly reduced.

Nozzle Size: 0.4mm

Layer Height: 0.2mm

Walls: 4-5 layers

Infill Density: 100%


  • PLA+ (eSun, Polymerk or stronger)
  • PET-G
  • Nylon

So what are you waiting for? If you are looking to LARP like an operator out of Rainbow Six the MP22(K/SD/Carbine) is the sub-machinegun for you!

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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 ( does not host, provide, develop, and/or have any affiliation with the firearm STL files or All files are hosted by a third party.

Dan M.
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