MagC thread confirmation

[modamag]

I'm trying to figure out the MagC thread at the tailcap end for the PocketMate-V Group Buy.
It looks like 1 1/8" & 20TPI. But when I measured with my caliper it's 50 mils off according to the threading standard book.

Can someone confirm this.

 

[XtremePyro]

Hmm, interesting. Appears as though the major diameter of the threads is 0.030" smaller than the minimum allowance for 1 1/8" -20 UN but 0.024" larger than the max allowance for 1 1/16" - 20 UN and the minor diamter of the inside threads is 0.020" smaller than the min for 1 1/8" and 0.030" larger than the max for 1 1/16".
So Im guessing that either Mag is in some way using a propriatary thread due to design, or just sloppy or worn tooling. If you looking for a tap to recut threads in the end of a C mag body after shortening it then 1 1/8-20 UN will work, there will just be some "slop" between
the new threads and the tailcap threads.
Hope this helped some.

Tim