So i have recently bought a aps acp from a friend and it has minimal wear, Used 1-2 times in game. The problem im having with some of the mags is that when i got to drop the Co2 in the mag it doesn't go in all the way. its not getting caught on anything. Its air underneath the co2 that cant escape so the Co2 cant go in all the way. Im not sure if i should file down the inside of the magazine or what. And another thing i want to know is if there are any slide i can drop onto the aps acp that will work, I want to use green gas mags since i already have a bunch from tm and we glocks.