The PTR 91 series of rifles are essentially HK91 clones that are built here in the USA on old Portuguese tooling. The rifles are priced right and shoot well, and many people are rediscovering the joys of roller delayed blowback as a result of their being on the market. So what do the guts look like, and how do you get to them?

Big thanks to Ventura Munitions as always!
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