Used MR-1 Help

[mrmr1]

First of all I am new to paintball and the equipment, so any help or direction on where to go next would be great. I bought a used Spyder MR1 from someone for $60 and I cannot get it to function correctly. I know it did work at one time, because I borrowed it for a day from the seller and it worked great.

It will shoot 1 to three balls, sounds like it goes ‘full auto’ - then chop one right where the ball get fed in. I took it apart, clean it, replaced all o-rings, lubed, and re-assembled according to the manual. I even replaced the little rubber ball detent thingy. I filled the tank to 3K psi and tested again thinking the 1K reading was lower than indicated; same issue.

Anyone have any ideas? Thoughts? These mech markers seem sooooo simple…. I must be missing something?

I looked at what documentation I could find, but I can't tell if the pressure regulator is adjustable or not...