You do not have to do anything to the mags. Springs are fine. Remember guys...even on the internet the info you get is anywhere from a month to 10 years old. It just gets repeated until it becomes "truth", except it is just outdated info or old, not yet solved problems. You guys keep repeating old info instead of listening to new info. AR stoner 30 rnd mags(purchased from Midway) work perfectly without any mods to springs, etc.
I've been running 7.62x39 ARs since during the dark ban days when all we had were plastic ten-round magazines. I've hunted Texas deer and hog with them for well more than a decade, and probably put ten or fifteen thousand rounds downrange through various builds. I am absolutely not a guru or expert, but I am what I would characterize as a pretty dang experienced user. In all of that, I've run every single brand and style of magazine for the 7.62x39 AR that I could find. The latest/last generation C-Products mag (now ASC) are clearly the best, and emulate the FrankenMags of old.
But they are not perfect.
If you shoot brass cased ammo and keep the magazine clean - you'll likely never have any issues. However, if you shoot polymer or lacquer coated steel cased ammo, you will likely (greater than .5 probability, in my experience) experience a feed hangup in the current ASC/C-Products magazines sooner or later. The combination of steel cased ammo, highly tilt-y follower (needed to make the round stack work in the straight magwell of the AR), and heavy ammo stack above the spring (remember that the 7.63x39 round is roughly twice as heavy as the 5.56NATO equivalent) all seem to conspire to occasionally cause feed issues in these magazines.
The symptom is simple - the round stack jams up against the inside walls of the mag body somewhere down inside the body of the magazine and as a result nothing comes out the top. The fix is equally simple - either don't load the magazines all the way, alter your ammo choice, rigorously keep the insides of the magazine slick (I know of folk that spray the insides of the mags with dry-film coatings), or take the simple brute-force approach and use more robust springs. I choose to use the Wolff +5% AK magazine springs - they fit well, are designed specifically for the weight of the round stack, and seem to retain their rated tension longer than the stock magazine springs.
If you've managed to not experience this issue, that's great. But to dismiss it out of hand is not entirely appropriate IMO, because enough of us have experienced it to know that it is a very real potential issue that can be easily avoided if you're willing to think about it.
I choose to change the springs as soon as I get the mags in my hands. It eliminates a potential source of issue, and it doesn't cost a lot to do.
