sanding down mags
well if you already have them it's just an easy fix. and it's going to be a case to case or individual marker to mag issue. what will be fine in one will be a little tight in the other. with the plastic mags you might even notice a difference on hot dry days opposed to cold and wet. all the materials expends and contracts with the weather at different rates. I'm sure some of the folk on here have had experience with delrin bolt stick from temperature and humidity changes. or there marker just was not working right that day and could not figure out why.
I've got 20 plus markers and 2 of them might work!