In order to use a can on a PTR-91 or other G3/91 clone, apparently it's necessary to use a different locking piece that slows down the bolt carrier with the increased back-pressure. Rim Country Manufacturing sells a
#17, 36° part that fits the bill. $50 ain't so bad. They also have US-made trunions, bolt carriers, and bolt heads for MP5- and 53-type actions.
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