I have recently received my delrin bolt from www.tacticalmods.com
(manufactured by www.spudnukl.com
) and I must say, it is quite impressive! I was able to dry rapid fire my SIM-4 at an astonishing 175psi!!! I've yet to do testing with paintballs to see what the psi will need to be for a good FPS, but the results thus far are very promising...I'll report back here after my testing is complete.