Statistics of two, both from Boyds, one for Ruger American Predator 6.5cm,
other for Ruger American Rimfire 22 mag (new thumbhole style)
and both required a couple hours of dremel work to get mag release acceptable.
Both would not allow mags to be fully inserted without the mods.
If I didn't mind a sticky mag, could have been done in 1/2 hour each.
Went with B&C for last RAP refit - it was flawless, worth the extra $$.