barrel and pipe size for 3d Print SPNKR

[DanielPhoenix27]

I'm currently 3D Printing the M41 SPNKR (Reach Version) that was made by TheApropalypse.
the person who made the files has deleted the information on what materials I need to build it so what pipe and rod size do I need?

 

[SpartanSweed]

I would print off a small piece that goes around the PVC to find what you need