Bulgarian waffle mags are tops IMO. I have no experience with the WASR rifles. The waffle mags being polymer coated may be a bit over spec depending. I wouldn't start filing on the mag well, and I wouldn't start carving on your magazines. I'd just break them in to your rifle by inserting and ejecting them (empty magazines) time after time until they work well. No....$30 aint cheap now. I got plenty of them when cheap was cheap. Break them in the right way, and don't even think about carving anything on the rifle or the mags. It will happen with wear and tear.