Tpi?

Not clear what you're referring to, but TPI usually means "threads per inch"--for example, a bolt that's 1/4-20 is 1/4 inch diameter, 20 threads per inch. If that's what you're looking for, you probably need to specify what part/screw you're talking about.
 
Not sure what other threads there are on a Garand receiver

But to be more specific. The number of square threads per inch on the front of the receiver that matches the barrel that screws in to the receiver. :rolleyes:
It is just that I don't have a squre thread pitch gauge, but using the 60 degree "V" one I have it looks like 10. Just looking for a confirmation.
 
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