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Discussion Starter · #1 ·
I am working on shortening a TT-33. I carry 3rd gen Zastava M57, and I want a smaller companion gun. I'm going with a bushingless bull barrel arrangement.

I am currently trying to sort out the recoil spring replacement.

I have a space 11.3mm by 18mm for the compressed spring in full recoil.

If I can fit a nested recoil spring assembly off of a glock, there are many weights avalable cheaply.

but darned if I can find the diameter of a glock spring assembly online, and I don't have a glock to measure.

Gen 4 glock subcompacts looks close.

I'm hoping somebody out there can measure one, or knows off the top of their head.
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