. Here in Australia its very hard to get the right parts/right sizes you want to build one of these guns!, I got hold of the clear acrylic tube( At last!) its a weird size but the best I could do.its 38mm OD X 32mm ID the other size was 24.5mm OD X 19.5mm ID which was going to be too small internally, now ive made the piston using a piece of rubber diaphragm from the inside of a sprinkler valve attatched to a bottle cap with a nut. I think the seal must be too tight!!?, the spring its reasonably strong but it wont push the piston: I need to know if the piston on the inlines has to be reasonably airtight or does it sit in the bb chamber reasonably loose????.
I thought it would have to seal pretty well as to not waste the air in dead space of the bb chamber!?? I am finding it hard to drill through the Clear acrylic sheet as well?. I used both a 3/4"spade bit and also a 3/4" hole saw on the drill but it seems to skip about and make an elongated hole!!!, the sheets only 10mm thick but it wont cut a clean circular hole for some reason?. The spade bit was old but the hole saw NEW , same effect both times????.
I am having to plug the barrel end with a THREADED 32mm ENCAP as its all that will fit! unfortunately its gonna look a bit wierd, ive had to order in the 1/4" stainless tube for the barrel and wont arrive for 2 weeks
. I'll be using .177 bbs in this one as I have all my others, the other issue is the tube is only 3mm thick! so I will have to figure out how to make a part of the tube thicker where I will be inserting the 90 degree brass nipple that goes to the blowgun. Oh the joys of building guns in Australia
