As Symes said, I was having severe problems with mine.
I tried FS Paint (all season), Valken Echo (winter), Valken Fate (winter), Valken Tactical (winter) - if hand fed, shoots great. If the Pulse RDR is on, breach breaks pretty much every other shot.
As soon as I put a Spire or Rotor on it, the paint shot 100% fine. Conclusion; the Pulse RDR is putting too much pressure on the ball stack and winter paint is breaking in the breach.
Oh, I also tried 2 different markers; a Valken Proton and a Planet Eclipse Etha.
One last thing; thanks Symes for giving me some GI Winter paint - it did shoot better, but got 3 breaks still
So far, GI Sportz haven't replied back to me.