Tolik, dump the drums–get standard 30rd mags. The drums are actuated by a clock spring. One day–while winding it–you’ll experience it breaking. Could be the first time you use it, or the 10th, or the 50th or… You’ll have no choice but drop it on the ground and run as you slam another another into your weapon. You’ll lose the ammo in the discarded drum, and maybe get killed while changing it out. The 30 rnd mags don’t fail, and if one did, takes less time to drop it and install another, the loss of ammo will be more manageable. The springs in these “banana” mags won’t break, but should they fatigue, and feed unreliably, you need only pull the bottom plate when you have time, and remove the spring and stretch it a little–like new! Good luck!