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The o-rings I ordered in the previous post were a little big and so I used one of the replacements that came with the gun. It did help the pumping action. If anyone knows a good replacement o-ring that is better than what comes with the Origin and where to get it let me and everyone else know.

I ordered six of the AS568-007 UC90 Cast Polyurethane 90 Duro O-Rings. I think that is the correct one. My Umarex Origin pump seems to be too hard on the up stroke and down stroke. I may have over-heated the o-ring on the first fill of the rifle.

Thanks. Which spring in the Home Depot picture did you use (i.e. the 7th from the left in the second row)? I think I'll try this without drilling the holes in the barrel shroud.

I have seen the Strip Stak Pak that Hajimoto makes and watched the videos. Appears that the baffles take up all the room in the barrel shroud ahead of the barrel. Did you have to leave out a baffle to get the spring to fit. And what kind of spring did you use and where in the stack did you...

Were you using these baffles with a spring on an Origin and if so who makes them or did you make them yourself?

I just got an Origin as well for $300. I am also new to the PCP world. So far I am very pleased with the gun. Shot a 10 shot group that was slightly over 1 inch at 50 yards using the JSB Match Diabolo Jumbo Heavy 18.13 grain. I really think I can do better. I am finding that I really need a...