i have a 4500 flatline that has been giving me headaches.
I recently replaced the reg seat when one of the originals when bad. I replaced it with one of the newer style seats that are supose to be harder and last longer.
well then after to refills that started to spike. Now i have another one, but i cleaned and oiled the one that was still in it. It was no longer spiking, however the gauge will drop by 200-300 psi after one single shot. It will bounce back almost imediatly. However, in a string of shots it will drop to the point LX starts to kick in and wont fire right. I throw my 4500 max flo on there and that has no problems what so ever keeping up with my xmag.
I really love the light weight and compact style of my flatline, but it is really starting to piss me off.