putting back together

[madmag21]

when i took apart my mag the pin in the rear regulator fell out...i need to know what hole in the rear reg to put it back in...there are 3 holes witch on do i put it in?

[EnW]

If you are talking about the little "Z" lock pin that slides in the groove of the body rail....put it in the hole that is offset from the other two.
I don't have a standard A.I.R. valve in front of me...I am looking at an old 8-hole reg.
I am pretty sure they are the same.