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Hi all, After years of work my custom marauder is finally finished. the barrel and breech was made over at Jefferson State Air Rifles back in 2019 when they were still doing custom work and they could not have done a better job. Specs: .- 20in .357 threaded Lothar Walther unchoked barrel ...

Hi Airgun Nation, I've had my custom .357 marauder for about a year and a half and it has had leaking problems for about 8 months. I use to hear a little air coming out of the transfer port at a relatively fast rate but I was able to fix that but now I have an extremely slow leak. I'm...

Hi all, I did a post about my marauder with a cothran valve leaking a little while ago. so I changed the o rings to find out the air is coming from the valve. that says to me that the poppet might be stuck and that is causing it to leak air. Should I carefully take the valve apart to examine...

So a few months back I finished my .357 build for my marauder and all of a sudden I started having air leaks everywhere. I got the JSAR aluminum tube for it and I'm getting air leaks out of the fill port and the pressure gauge. I've already replaced the orings except the small one under the...

Hi Everyone, Would anyone happen to know anyone who makes custom barrel bands? I'm in need one for my marauder .357. The barrel is nearly the diameter of the shroud but there is a slight barrel droop since its a heavy barrel that is 25 1/2 inches long. Thanks, Matt

Hi everyone, I want to put a 15.7 pound hammer spring in my marauder that has a cothran valve in it. would the 15.7 pound hammer spring damage the valve in any way? I can't find a solid answer. Thanks, Matt

Hi Everyone, I'm trying to get in touch with Jefferson State Air Rifles and none of their numbers seen to be working. does anyone know which number has worked?

Hey everyone, I don't have access to any machinery, so I was wondering If I could drill a larger transfer port hole with a hand drill. I have a heavy duty one and I saw somewhere that It can be done.

Hi everyone, Does anyone know here i can get a .357 barrel for my marauder. I have a big bore breech and powerhouse valve. .25 slugs are getting boring :). I want something bigger.

Hey, Everyone so I've been hunting around the web and I cant seem to find anyone that makes longer .25 marauder barrels, or higher calibers. I looked in TJ Enterprises and I can't seem to find anything(or do I have to call in?). If anyone knows any places or websites that would be great! Thanks.

Hi Everyone, Next week I'm going off to college and I was wondering what I should do to my custom .25 marauder(Cothran Valve, reservoir extension, etc) before I leave. It will most likely be three to four months before I use it again and I usually keep it in my cabinet at 2000psi...