Gunsmith Showcase

Japanese Nambu Type 100/44

Reverse Engineering

My interest in the Japanese Nambu Type 100 submachine gun began by playing video games such as Call of Duty: World At War, and Red Orchestra 2 / Rising Storm. At the time, back in 2015 or so, I was only an aspiring gunsmith with limited access to machinery, so my focus was entirely academic. Learning how it was designed, how it functions, and how it was made became the topic of my study off and on for almost 10 years. 

In 2017, I visited the Fort DeRussy military museum in Honolulu, and was able to be granted access to the museum's archives, which provided me a wealth of knowledge to get started. That was the first and last time I saw a Nambu in person.

With the project on hiatus for many years due to lack of new information and reference material, In 2024 - as luck would have it - one of my friends called to let me know that a deactivated Type 100/44 barreled action had made its way into their shop. I was invited to go over and pull dimensions off of it, and ended up making a cash offer on it to bring it home. Now, we have everything we need to make our goal a reality.

The goal here is to reverse engineer the Nambu Type 100, develop a working semi-auto prototype, and produce both DIY build kits and complete functional firearms, as close to the real deal as we can get.

Be sure to follow along on Youtube as we make it happen!

Remington Rolling Block .38 SPC.

*Work in Progress*

This project involves an antique Remington Rolling Block rifle, originally chambered in .43 Egyptian, that was purchased from Apex Gun Parts. Since .43 Egyptian is an obsolete cartridge, we determined that .38 Special would be a viable alternative to re-barrel this rifle into, as the maximum allowable pressures for .38 SPC are considerably lower than known values for .43 Egyptian. 

We removed the original barrel, and used its threaded tenon to create a bushing to press onto the new donor barrel, allowing us to have threads that match the receiver without having to re-machine any. We also made a headspacing shoulder that pressed onto a knurled section of the barrel, and secured it with Loctite press-fit adhesive. 

When it is finished, we will have a modernized, yet visually appealing traditional trail carbine in a modern cartridge that is entertaining and affordable to shoot.

Mosin-Nagant Rifle "PSO" Sight Adapter

Designed, prototyped, tested, and manufactured in house. This was designed to allow a WW2 era Soviet Mosin-Nagant rifle to accept a cold war / modern era "PSO" style optic in the place of its original WW2 era "PU" optic by installing this adapter into the "Kochetov" PU scope receiver. 

The original prototypes were 3D printed as a proof of concept, and then the first metal prototype was manufactured from three pieces and screwed together. The final version was machined as one solid billet piece, with several design changes made to improve weight reduction, rigidity, and fine-tuneability.  

August of 2023 saw this project in its final form. Version 3 went back to the two piece design, utilizing its own baseplate rather than relying on the original PU style bracket. The receiver mount bracket uses the same screws and hole spacing as the PU bracket, and then the sight dovetail bracket screws into the receiver mount. 

These mounts are manufactured entirely in house, and are currently in production. To place an order, you can order directly from our webstore, or find our listings  on eBay and Gunbroker!