used to have this up here,but i cant find it so im re-doing the post ( sorry it it turns out as a repost)
see the pin that is slighty of center to the other two pins? thats the boss pin and it will need to be dremeled out in order for the two pieces to seperate. simply push the other two pins out first (with all gas pressure removed) before you dremel the boss pin. this will allow you to see how far you need to drill in order to seperate the pieces. the boss pin is only a few mm long so you will need to be careful not to over do the drilling.
above picture is what it should look like when drilling is complete and you are ready to seperate the pieces.
above picture is what you will see when you seperate the pieces. you will notice that a small brass valve and a spring will fall out when you seperate the two pieces. just simply toss these as they will not be reused. i like to use jb weld to fill the hole where that pesky little valve used to be. be sure to let it sit for a day before using. you will notice a small o ring on the base of the mag, place a small amount of silicone around this o ring and give it a few minutes to skin up before re-assembly. you only need a little silicone as to much will make re-assembly more difficult. once this is complete you simply re-assemble the pieces and you are good to go. periodicaly you may need to disassemble the mag again to re-do the silicone seal so its advisable NOT to epoxy up the boss pin hole as this will make dissasembly immpossible in the event if another leak. after i repaired my mag with this method im capable of getting exactly ( tested ) 150 bb's per gas charge.
well there you have it,,hope this helps.