The MouseMag 32

This project was inspired by my friend Mouse who provided the advice and encouragement needed to get me through the project.

The MouseMag 32 is a heavily modified Kel-Tec P32 that fires a wildcat cartridge. It will fire a 60gr bullet an average 1268 fps, developing 214 fpe. That is more than most .380acp rounds and flirting with low end 9mm power numbers.
SPRING SYSTEM - I attached a .590" barrel made from a .357mag case to allow for longer springs. This also allowed me to use a full length Kel-Tec P11 guide rod.
The springs I used are a Kel-Tec P11 outer recoil spring and a Kel-Tec P40 inner recoil spring. This provides fantastic recoil absorption and plenty of spring power to snap the action closed with authority.

Pictured at right are the stock P32 spring system (top) and the MM32 spring system (bottom)
Using the larger diameter guide rod and springs required enlarging the openings in the frame and barrel lug.

CHAMBER - I used a .3437" standard reamer to deepen my chamber depth to .751". I then used .30 carbine cases cut down to .751" to lap the chamber using valve grinding compound.

CARTRIDGES - To make the cases, I begin with .30 carbine cases. I trim them to .753". Then I ream the inside of the case mouths to .3105" wide for the first .2". Then I anneal the cases for a longer service life.

My loading process is as follows:
  • clean and deprime cases
  • size the case using a Lee .30 carbine sizing die
  • prime the case
  • flare the mouth and charge using a Lee .32acp powder through expanding die
  • seat and crimp the bullet using a Lee .32acp seater / crimping die, with a spacer on top of the seating plug

I have used a few different .32acp JHP bullets and an undisclosed amount of Bullseye powder.

32 Defender Gel Test Results

As you can see in the picture, the new rounds on the right are larger than stock .32acp rounds on the left. I can fit only six rounds in the magazine instead of seven .32acp rounds.
BREECH / EXTRACTOR - To aid in feeding I gave the breech face a high polish. I also sanded a bit of material from the inside face of the extractor and gave it a good polish. This was needed to accommodate the thicker rims of the .30 M1 Carbine
This is one outstanding little pistol. It is no doubt one of the most powerful pistols under 10 ounces in the world. I take a lot of pride in having built it myself and in knowing that there are VERY few like it.

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