Marauder Troubles?

It happens. You should get a new oring and lube it good with silicone grease. You can find the oring at Home Depot, its called #247, 11/23" O.D. X 7/32" I.D. X 1/16". Keep some spares around as this happens from time to time.

JDShapp,

The oring symptom happens when I cock the bolt back and forget to push the bolt forward. I always know if I forget because the shot sounds muffled and it's sometimes a pain in the butt to remove the magazine.

CJ

This happened to me with a brand new marauder... very easy to put back in.... and keep it lubed...

Very common. I keep several o-rings in my range bag

npunk42 had some very precise dimensions--and given that my replacement seems a wee bit off he is probably right. I blew it a couple days ago and with the replacement the pellet seems to rub ever so lightly against the ring moving through. it was a Danco 8 at Lowes. But it stopped the noise. And no puff of air. I avoided anything sharp in putting it in. Just bent it with my finger a bit and pushed one side in--then slipped in the other side.

Likes someone mentioned above--a jammed magazine might go along with this--it did so for me. But I had been getting a lot of fliers and replaced the clip with a single shot tray and it is shooting better. I have had two magazines and each one got terrible jams.

I

Like CJ said it will happen if the bolt is not fully closed even a little bit . Also for the marauder peeps out there I noticed on my 177 and 25 that the guns would shoot tighter more consistent groups if the stock bolt was not tight but not loose either, less than finger tight if that makes sense. Neither gun wanted it tight with Alan wrench, I picked that up from shooting Springers and for some reason some like it loose