Benjamin Marauder Pistol Air Tube

Check with Mountain Air. 

Try cothranmachine.com -

Don doesn't list one on his site, but he does take requests, and will often do a one-off, so I would contact him from his website -

I'm getting started with the same project. Don Cothran has the measurements for the P'rod tube and can make them up to your desired length.You might want to consider leaving out the hole for the gauge in order to gain a little more air volume.

Yep, Don Cothran made me a custom length prod tube at 18.5". Basically 3 inches longer than OEM. Pairs nicely with the WAR moderator installed. I'll upload a pic when it's put together. Waiting for the Huma regulator before assembly.

Keith,

I have seen pictures of Ray's 1720T. I think it was his go to gun for certain travel restrictions.

Way back when, Marmot Militia made me a long tube for Prod, but that and follow on company, WAR, is gone.

Being you are building a rifle, using a Fortitude air tube can be an option. There would be a few different ways to go. It is about 9 1/2" longer than Prod/1720T air tube, which works well with a shrouded 20" barrel.

Keith,

I have seen pictures of Ray's 1720T. I think it was his go to gun for certain travel restrictions.

Way back when, Marmot Militia made me a long tube for Prod, but that and follow on company, WAR, is gone.

Being you are building a rifle, using a Fortitude air tube can be an option. There would be a few different ways to go. It is about 9 1/2" longer than Prod/1720T air tube, which works well with a shrouded 20" barrel.

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Would you happen to know if the pistol trigger group will bolt up to it or is there some work needed to make it work? Also do you know if they are both the same diameter tubes? If so that would help in being able to use some upgraded parts for the marauder. 





The pistol trigger assembly, should bolt up and work, but I have never tried it on the Fortitude tube. I did try it on that MM tube, for a very short time, but found it very awkward. On converting to the longer tube, stocked rifle, have always used the Mrod Gen 1 trigger assy. It is better, and especially if you are looking at a competition rifle.

The Prod, 1720T, 1701P, Fortitude, Maximus, and Disco all use the same diameter tube. What can actually bolt up or easily modified to do so, is model dependant. 

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Keith,

I found a couple of pictures with the MM air tube and the pistol trigger assy. The Fortitude air tube is a few inches longer. Sorry, about the curve in the camera lens.

This is where those choices, options, and consequences start to come in.

The 1720T breech has a nice wide opening for single pellet loading, but it's O-ring style bolt does not fit in the Fortitude or Prod breech due to lug location. With a Fortitude or Prod breech, I would not recommend a shroud, especially if getting a custom machined barrel where the OD will likely be larger. ie not enough space to provide much quieting effect. It also limits the LDC diameter for barrels that don't extend pass the end of the air tube.

Using a Fortitude air tube with a Prod or 1720T breech, is not a complete drop in. You have to drill the two holes for the forward breech screws, and Dremel one hole to have three valve screws with the matching Prod/1720T valve. Fortitude only uses two.

In allot of ways, starting with a Fortitude base, may be easier. The breech is slightly taller than the prod and 1720T allowing for a Mrod diameter shroud, but is does have the narrow slot that makes single loading harder. To get away from an O-ring in barrel, would require machining on the bolt, typically preferred in competitions. If you want more power than an oem Fortitude, it does require a custom bridge to get a larger plenum.

Here is allot of Fortitude to Prod parts comparison: Fortitude Breakdown

25 cal Fortitude Conversion, which includes going to larger plenum: 25 Fortitude

This project I did prior to the Fortitude that converted a Maximus tube to a Prod one. It has the two mods I mentioned above. Maximus Prime