i purchased the 10 round mag like 12 years ago i was going to block it so i could use my 91 for hunting but i just use my rem700 instead, i kept it around because i always wanted a PSG-1 and the fact that its on a PTR91 receiver in this damn state means i cannot put one of my 20's into it.
no i did not heat treat it. factory H&K's arent heat treated either they aneal them to releive stress. basicly heat the whole thing up and let it cool slowly over time. i've never heard of anyone with a home build haveing any problems as far as stress cracks or etc... as long as the person who put the rifle togeather used a TIG welder and the proper amount of heat for penetration without overheating the part
if you need a 10 rnd mag THMPR i might be able to find one for you give me some time to track one down, last i checked PTR91.com had some but that was a while ago
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