Aside from the standard Ruger rotary mags, I recently picked up one Butler Creek 25 round smoke mag with metal feed lip, and one Shooter's Creek 25 roudn with plastic feed lip. The BC works fine. The SC is useless. It fails to feed 100% of the time unless you pull down on the magazine while shooting. Comparing it to the BC mag, the feed lip is just too high, by 1-2mm. It's manufactured wrong.