I have been out of the shooting game for 3-4 years so I am a little behind the scene on the current magazine situation so please forgive my ignorance.

If I had a couple of 30 round AR mag bodies with no guts or floor plates and I wanted 20 round mag bodies is it legal to trade with the current laws?

Just wanted to find out if I need to modify my 2 mags or if it was possible to trade off and avoid the work.