This is true. My 91K wears a 93 forearm. The fit is a bit tighter up at the pin and you will probably need to remove just a bit of the forearm material where the forearm fits up against the magwell. Go slowly with a Dremel or file and you should be good in ten minutes. It's an easy alteration.
I'm familiar with the PTRs, but wasn't sure whether their rail forearm was held in place with a standard HK pushpin or a screw or something else altogether.
The PTRs are built on the former Portuguese FMP tooling.
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