i know of two main sizes we use in NZ, .68cal which is 17mm and you cant get 17mm pipe so you have to get pressure rated 20mm pipe the second option is using 6mm PBs the size of normal BBs and you can either use 5mm copper pipe or a bigger bore pipe and use a sabot and make your gun shotgun style.im taking that you live in a metric country as you asked for cm/mm not inches and i know in metric countries its hard to get/find SDR pipe so you might have to rule out using 1/2" SDR13.5
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