[lurkingknight]

take your tappet spring, clip off the loop that holds onto either the plate or the post on the mechbox... take needle nosed pliers and bend out another two loops to replace the piece you just clipped off.

This increases your tappet return tension vs the strong spring of your mags, sometimes the mag spring can disrupt feeding.

What brand BBs are you using? some brands don't roll as well in the mag and cause feeding issues with more BBs in a mag.

Also list all the work you've done in the mechbox since the last time it fed properly.