I first heard it was not a good idea to leave gas in mags, then I heard it a good idea to leave a LITTLE BIT in there. It makes sense to me as leaving a small ammount will keep the o rings compressed against the gaps, thus keeping a seal. I have left a TINY bit in my KJW M9 mags lately, after spraying a small ammount if sil spray into the gas ports. I figured the sil would find its way to the holes and seal them nice. When i say a small ammount, I mean a SMALL ammount (what I do is leave the can upright and press the mag onto the fill valve for a half second, just to create a small ammount of pressure inside). It seems to work very well after a few months. One mag is old with a new o-ring set, and the other is new. Both hold a seal just fine.
IS THIS A GOOD IDEA OR NOT? IS IT CAUSING DAMAGE?