Yes, mags will need to be modified. The front Trunnion locking lugs are AKM spec, not 74 spec. Some choose to alter the lug slightly to accommodate for this, but I wouldn’t mess with them. First, take off 1-2mm off the front feed lips, this will allow for the space I mentioned previously. Next on the top of the rear locking tab of the magazine, take a file and slowly remove material unit it snaps in, go slow and try to keep the original geometry of the tab as possible. I’ve found that black circle 10’s require the most work, the smoke ones, very little, same with Beryl mags. I haven’t got a PSA mag yet to try.