Marauder....

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Similar to what others have said, but with maybe a bit more info. Not all bore cleaners are O-Ring friendly, and of course with a patch getting stuck, it may have added to the problem. There is an O-Ring which fits in a groove on the INSIDE of your bore, near the breech (magazine end), which seals the contact between the Bolt and the inside of the Bore. If this O-Ring is damaged or missing, it will act as you have described. It is difficult to inspect on an assembled Marauder, but you might be able to get a peek at it. I would check that first. 
 
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Here is a picture of the seal to check...
1522591989_18778034475ac0e8f52fa438.45289412_breech seal.jpg
 
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It just pops in, but it is tedious to do when assembled due to limited working space. Personally, I would put it in without major disassembly, unless I was wanting to do additional things to the Marauder. If you call Benjamin/Crossman and tell them you need a breech O-Ring for an XX caliber Marauder, they can get you the right part.
I would be tempted to search the floor where you were cleaning your gun, and try to find it.
 
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I believe you are actually looking for part number 33. The tube on the far right is your actual barrel. The other two O-Rings are associated with the sleeve which the baffle tube screws down on.
​Your best bet is to call their support, and tell them you need the O-Ring which is INSIDE of the bore at the breech end of the barrel. Tell them it is the O-Ring which seals the bolt inside of the bore. Be sure to give them the caliber of your weapon. By the way, what is the caliber of your Marauder?
 
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I chuckle when I see that diagram. So few of those parts are still in my Marauder. Yes, number 1 in that specific diagram is your missing breech O-Ring. I tend to prefer either factory O-Rings, or very highly reputed upgrade O-Rings. If you choose to fully take apart your marauder, pay very close attention to protecting the O-Ring on the Gauge block, as there is a very sharp burr from the factory where the gauge screws through, it tends to slice the rear O-Ring on the gauge block during removal and installation. Many people deburr that hole when they have it apart to avoid harm to future O-Rings. Also, the O-Ring at the port to the barrel (number 2) is easy to lose as well; watch it like a hawk. It may remain on the port, or be stuck to the barrel during disassembly. And finally, fully degas your air tube before any disassembly. Usually, firing 60 shots is sufficient to achieve this. I fire until I hear no sound, other than the click of the hammer. 
 
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Once you find your O-ring, might actually have one at Home Depot that will work. Get a wooden dowel rod that with slide down the barrel from the muzzle end. While working the new O-ring into position use the dowel rod as a back up to position the O-ring into the groove. The dowel makes it a 100% easier. This will save you from having to dismantle the gun any further.
jk
 
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I ordered an o-ring kit from Captain o-ring for my Benjamin Maximus 22 when it was leaking air. I took the whole rifle apart and looked for damaged o-rings but couldn't find any. During this process, I found that nearly half of the o-rings weren't even the proper size. In the end, the leak was coming from the foster fitting at the fill location, which turned out to just need some thread sealant to make it stop leaking.

If I ever need o-rings again, I will contact the manufacturer.

This should be an easy fix for you......good luck!! :)
 
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