Snowpeak Snowpeak M50 does anyone what thread but stock snowpeak uses?

I have an M50 that needs a butt stock so I need to know what to get. Hoping to use something standard locally.
Did you get anywhere with this, am trying to find the answer myself. Judging by my calipers the thread is either M29 or M30, but as to thread pitch.. It's not a standard AR15 thread, unless I've got a duff AR15 adaptor myself..
 
Did you get anywhere with this, am trying to find the answer myself. Judging by my calipers the thread is either M29 or M30, but as to thread pitch.. It's not a standard AR15 thread, unless I've got a duff AR15 adaptor myself..
I used a folding stock adapter and had my gunsmth machine an aluuminum plug to atatch it. it works but not ideal! id sell both Snopeaks if you would be interested. the m50 is 25 caliber the other one was new in the box when i got it its 35 caliber.