The 45 Mauser Mystery

Addressing the issues I found when using an adapter to convert a Mauser 98 to 45 ACP.

by R. M. Layng

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This article pertains to an issue I ran into when assembling a Mauser 98 adapter kit to convert it to chamber and fire the 45 ACP cartridge. Before I get into the article at hand, I would like to say that the first kit I purchased from Rhineland Arms ( was a true drop-in fit, and the instruction booklet they included with the kit is perfect for getting the carbine up and running in less than a day – minus the minimal stock work needed to get the parts to fit and function, but that will be covered appropriately later on.

This article covers the second kit I purchased from them. The threads on both the receiver end and the muzzle end were both oversized. It was evident that while the thread pitch was correct, the root diameter was just slightly too large. My final tally was 0.007″ too large, and while that number doesn’t seem like a very large excess, just the tiniest glut in size of a root diameter of a thread will cause it to bind. I attributed it to the finish added to the exterior of theā€¦

Read more in the July 2022 issue.

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