The quadrail had to be slightly modified with my Dremel to get it to fit my Yugoslavian rpk. The non-Yugoslavian rpks may not need to be modified, I'm not sure. Once modified, it seems to work very well, and does not vibrate loose like some others will. It is a high quality piece, and it is over-priced, but it was the only rail that I could find for my rpk. If you are ok with the price, then it will work well on your rpk after modification.
Pros: Nice, high quality machining, works well once fitted, is the only quadrail I could find for the rpk
Cons: High price, needs to be modified to fit,
This review was written in the old system and had content requirements that are different than reviews written today.