I was wondering if any of you that own PTR91's have installed the HK91/G3 Heavy Recoil Buffer and if you have what kind of fitting is required. Seems to me that it should be a direct drop in. I have checked my stock recoil buffer(Which is wimpy) and there appears to be plenty of room for it to simply drop in and be bolted in place.
Here is the buffer I reference.
Here is the buffer I reference.

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