Before I'd start relieving the opening on the FEG slide stop area try the $35 FEG slide stop first. Since invasion of the clones ie FEG, Girsan etc etc, this seems to be the norm when mix matching parts. I've never owned a BHP clone, and only used Browning/FN parts when needed. Did it cross your mind that the Girsan slide stop hole in frame is not in spec to either FEG or OEM Browning? Plus I noticed how small the FEG frame slide stop area opening is. Going to be a hit or miss. Hope this works out for you though!