I have reasentally found a hole that has just appeared in my stock asa on my ion and air seems to get out thought it!?! is this normal on an ion the hole was where the warning sticker used on the ions asa!?!
it is normal for a hole to be on any asa... i cant think of the proper name for it... but basically excess gas/pressure is released through it...
if the bottle has no o-ring or a broken o-ring, then the air will not only be going down the macroline to your marker, but also trying to force in other directions... this excess gas is vented through this hole