Originally Posted by d4rksabre
Alright, I was just made an offer to buy a PMI-1 in really nice shape. What are the differences between the PMI-1 and the P68 besides the pump slide and the feed tube?
None really. Some P-68SCs came with a cartridge valve, but that is the only other possible difference I can think of at the moment. If you intend to tune for maximum performance the older non-cartridge valve is a plus anyway.