The major cause of AR malfunctions is a result of magazine issues.
Why deliberately use a magazine with a known problem? You will have to be careful using it, not to drop it and handle it carefully. At best, you will end up picking rounds up off the floor, and at worst, having it dump its entire contents into the action and causing a malfunction.
Look at how much you spend each week on ammo, pizza, beer, cigarettes, etc. You can buy a new Pmag for less than the cost of a couple of boxes of .223, or even a decent pizza for that matter.
Buy mags by the dozen, and throw them out when they are damaged or become unreliable.
Regards.
Mark