unreliable mags
I salvage usable parts and keep them for spare parts
I once had a Tokarev magazine that wouldnt fit my pistol, the mag body fit too tight, so I tried to flatten it down a little and it was still a poor fit, so I saved the magazine spring, the follower, the floor plate and tossed the defective mag body
a few years later I got some new Tokarev 9mm mags with a cheap plastic floor plate, so the extra steel floor plate I saved came in handy as a replacement part.
had some GI M1911 mags with broken stress cracked feed lip lips, I saved the followers and the mag springs
I reused the mag spring to fix another mag with a bad spring
I replaced all my GI black plastic followers in my 30 rd AR15 mags with the improved green non tilt followers and saved my original black followers as spares