I think he mentioned he wanted to lessen the diameter of the shaft not get a thicker one no? A 5/16 to 9/32 shouldn't be an issue and will probably travel quicker and shoot a bit more accurate. With a narrower shaft the added power may be unnecessary, ofcoarse you'll want to test that theory out
. The Billers are nice guns and can accomidate a thinner shaft on their track from what Ive heard, so if you do go that route good luck!
... Oh and if your afraid a 50lb striper is guna mess you up just rig a break away tip on the shaft, but I don't think thats an issue unless there is structure.
