Benjamin Benjamin Marauder leaks how often? And should I continue?

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Jun 9, 2025
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For those who have one, what’s your experience with leaks? Have you resealed it with new O rings and then had leaks again?
I bought one used and it developed a slow leak. In about a week it’s down to 1000 lb. I lowered the hammer spring tension and tightened the transfer port to get it down to about 700 fps. About 4 months after that it started leaking. I’m not sure if that had anything to do with it or not…

Here’s where I’m at with it. It’s a classic gun so not a bad one to have around. Parts being readily available… not really worth the effort to sell a leaking used one. Do I tear it down and put in all the goodies like an after market valve, hammer and spring plus seals? Or is the leaking just too prevalent with these guns it’s not worth the time and effort? Thoughts?
 
Well, lowering the hammer spring shouldn't have any effect unless it was pushing on the valve, which I kind of doubt it was.
As to the transfer port, that also has no effect on the guns abiilty to hold air, as it is after the firing valve.

Check the obvious things first, the gauges, fill valve etc. If it's not an obvious leak that is easy to fix quicly, then it's time to tear it down and replace all the orings. The Marauder is a solid design and a great gun, but any pcp will develope leaks over time, so don't be discouraged or think that the Marauder is not robust.
 
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You like RATT? said:
For those who have one, what’s your experience with leaks? Have you resealed it with new O rings and then had leaks again?
I bought one used and it developed a slow leak. In about a week it’s down to 1000 lb. I lowered the hammer spring tension and tightened the transfer port to get it down to about 700 fps. About 4 months after that it started leaking. I’m not sure if that had anything to do with it or not…

Here’s where I’m at with it. It’s a classic gun so not a bad one to have around. Parts being readily available… not really worth the effort to sell a leaking used one. Do I tear it down and put in all the goodies like an after market valve, hammer and spring plus seals? Or is the leaking just too prevalent with these guns it’s not worth the time and effort? Thoughts?
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They are very simple guns to rebuild. New seals and it holds air forever.
 
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Leaks are just one of those things that happen w/ pcps.It can happen whenever to. I gotten guns brand new that leaked. Then I got guns that are atleast 8 years that never needed a oring. I guarantee there’s some neglected marauders that been sitting 10-12 years and haven’t leaked haha.

Marauders are very simple and proven designs.They are usually very reliable guns. I’m sure you could find the leak and reseal yourself. Just take your time. If you’re just a little mechanical inclined you’ll have no problems. Plenty of videos and info online to help. Plus us guys here on AGN 💪

As you mentioned there’s a ton of aftermarket parts available. That can become a deep rabbit hole once you start ahaha. I just did a PRod myself. It wasn’t a cheap learning experience but I sure had fun. Totally worth it to me. Guess it just depends if you like tinkering with stuff. I like it as much as shooting the things.


Rob
 
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My leak experiences have been the check valve in the foster, the guage block orings (usual suspect) or the guage seat oring. There's not too many more other than valve body and air tube cap. Crc aerosol leak checker and a roto burr knife are your friend. Once the tube is deburred a little better it doesn't knick orings as easily.

This last rebuild after a deburr and captain oring kit has lasted 8 years charged the entire time.
 
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RobBonnell89 said:
Leaks are just one of those things that happen w/ pcps.It can happen whenever to. I gotten guns brand new that leaked. Then I got guns that are atleast 8 years that never needed a oring. I guarantee there’s some neglected marauders that been sitting 10-12 years and haven’t leaked haha.

Marauders are very simple and proven designs.They are usually very reliable guns. I’m sure you could find the leak and reseal yourself. Just take your time. If you’re just a little mechanical inclined you’ll have no problems. Plenty of videos and info online to help. Plus us guys here on AGN 💪

As you mentioned there’s a ton of aftermarket parts available. That can become a deep rabbit hole once you start ahaha. I just did a PRod myself. It wasn’t a cheap learning experience but I sure had fun. Totally worth it to me. Guess it just depends if you like tinkering with stuff. I like it as much as shooting the things.


Rob
Click to expand...
 
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You like RATT? said:
For those who have one, what’s your experience with leaks? Have you resealed it with new O rings and then had leaks again?
I bought one used and it developed a slow leak. In about a week it’s down to 1000 lb. I lowered the hammer spring tension and tightened the transfer port to get it down to about 700 fps. About 4 months after that it started leaking. I’m not sure if that had anything to do with it or not…

Here’s where I’m at with it. It’s a classic gun so not a bad one to have around. Parts being readily available… not really worth the effort to sell a leaking used one. Do I tear it down and put in all the goodies like an after market valve, hammer and spring plus seals? Or is the leaking just too prevalent with these guns it’s not worth the time and effort? Thoughts?
Click to expand...
Airguns with o-rings (if you want super reliability) should be serviced and o-rings changed every couple of years. the rubber hardens, flattens and deforms, etc...
 
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You like RATT? said:
Thanks for the responses. I’m going to keep it and put some parts into it. But first I need to find the leak.
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That's the spirit! They're great guns to have around and worth keeping.
The only leak my Marauder ever developed was from the guage, which needed to be replaced. Assuming it does not leak sooner, I tear the gun apart every 5 years or so to replace the seals. Even if it isn't leaking yet, most of the o-rings have taken a set and started to harden by then. I take the opportunity to inspect for moisture and other issues. Once you're used to it, a Marauder can be taken apart and put back together in well under an hour
 
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You like RATT? said:
Thanks for the responses. I’m going to keep it and put some parts into it. But first I need to find the leak.
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Right on! Working on them is rewarding and you’ll learn a lot. There’s so many parts or mods you can do. You could start with something simple and not to expensive like a SSG. Those work really well on an unregulated marauder. Flatten your string a little and get a lot more shots.

Good luck on your journey haha.
Rob

Oh here’s my pistol I just did. I got bit by the bug to modify and buy parts.

IMG_3668.jpeg
 
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RobBonnell89 said:
Right on! Working on them is rewarding and you’ll learn a lot. There’s so many parts or mods you can do. You could start with something simple and not to expensive like a SSG. Those work really well on an unregulated marauder. Flatten your string a little and get a lot more shots.

Good luck on your journey haha.
Rob

Oh here’s my pistol I just did. I got bit by the bug to modify and
Click to expand...

bearair said:
It can be a deep rabbit hole lol. The marauder is very easy to work on, get yourself a gauge port tool to decrease nicks when removing the valve and gauge block and a wooden dowel. Also a good leak detector to confirm once it's back together. That p-rod is really nice.
Click to expand...
One thing I’m realizing here is I will be working on all of my pcp’s. Sounds like it just goes with ownership. Even if it a high dollar gun. I don’t want old o rings in it one day. The every 5 years sounds like a good plan. I’ll need to start a tool kit list. Yeah that p-rod looks like a nice rat gun.
 
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