How much recoil does the PTR91 have?

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G3 recoil is very much dependent on the buffer in the stock (21E buffer is the best) and whether bolt gap is in spec. My HK91 had a 21E buffer and was very pleasant.

This...

The 21 buffer, MSG90 or the 2-stage heavy buffer makes a world of difference. As does the 21E clubfoot stock with its stout rubber buttpad...but the buttpad can be added to the regular G3/91 polymer stock as well I believe.

I'm also to understand that the Spuhr stock (while it looks out of place aesthetically) also helps by putting the recoil path in a straight line compared to the offset HK stock design that was a bi-product of how the Germans insisted on their sights.