First try to slide the mag follower front or back on the spring and see if adjusting the spring pressure front to back changes anything. Stretch out the spring a bit too while you’re at it. Might help.
Then start looking at failed or worn parts. There’s only three functional parts to the mag system. The spring, the box and the follower. Hit up Numrich and replace each part one by one until your problem is solved.
With all due respect, there's no need for that. The original parts will work just fine - they just need some tweaking..
