Posted on

Benjamin Marauder (Mrod), strip, teardown, disassemble and operation

Well, while I’m waiting for the BSA Super 10 receiver to show up, and feeling a bit more ambition lately, I shifted attention to my Benjamin Marauder in .177 cal.  I got this air rifle from Mac1 airgun shop a few months after the marauder was introduced.   It was originally in .22 cal, but I switched it over to .177 with parts from Crosman when I decided to go pcp for field target competition.   Now that the FT season is about over, I thought I’d tear it down, clean it, replace o-rings, and get my adjustments in place for winter practice.  My bi-annual airgun check-up, so to speak.

In this video, you may notice that I took out the pressure gage and block, and put a regulator in its place in the airtube using the gage opening as the regulator atmospheric air hole.  I got the regulator from Airgun Exporter a few years ago, and it still seems to work without any problems, so I’m not going to make any adjustments to it.  It puts out 130 bar to the valve, or about 1875 psi, which is a bit on the hot side, but leaves lots of room for the other adjustments.  I was getting about 40 shots per 3000 psi fill, at about 15 ft. lbs.  I wasn’t too concerned about having enough air on match days, since there is usually air at the match site.  But, I think I can tune it to get a little more velocity and ft. lbs., and  yet maintain that same shot count.   In terms of accuracy, this gun likes the JSB Exact 8.4 gr or Crosman Premier heavy pellets best.

Tuning the marauder isn’t particularly hard, but it does require quite a bit of effort to get the rifle set up the way you want it.  And a chronograph is almost mandatory;  without it, you’ll have to shoot targets after each adjustment, consuming substantially more time and air.  A chronograph saves on both, and is a worthwhile investment for any marauder rifle of pistol owner.

As an alternative, there are a number of professional tuners out there who can set up a marauder to whatever specs you want, within the limitations of the airgun or even a bit beyond.  These guys have already put in time to figure out how to get more shots, more power, more accuracy, etc.  Unless you enjoy the tinkering part of being a marauder owner, can handle the sometimes frustrating and unexpected results, and have the time and inclination, you might be better off having your airgun professionally tuned, i.e., save your time and air for shooting instead of tuning.

This video is my method of stripping the marauder rifle, and also a bit of explanation of how the factory adjustments work.  I’m always open to better methods or tools or techniques, so feel free to offer any tips you might have.   I’ll follow this up with the tuning video as soon as I get time to put it together.

Posted on

BSA Super Ten and Regulator

Ok, I’m at an impasse with my ‘project’ field target BSA Super 10, in .177 caliber.  I’m awaiting a new receiver to replace the old one, which I have concluded ‘flexes’ during the shot cycle and causes inaccuracy.  So, this project is on the shelf until parts arrive.  Watch for a future update.

But in the meantime, I have several videos up at my youtube channel, which are also shown on our video page here at this site.  Of course, I recommend servicing by a competent airgunsmith rather than owner servicing, but realize that this may not be an option for all owners in all countries.  In fact, the only reason I made the effort to service my own BSA Super 10 was that there were really no other options here in the US.  So, ror those who similarly have few options regarding repair or servicing, I hope that these videos are helpful.

I also promised to put up a link to BSA Super 10 resources, including a diagram (lifted from Knibbs);

Parts Diagram BSA Super 10
Parts Diagram BSA Super 10

And here are a few links to sites that may have parts or offer service or repair of your air rifle;

Joe Korick/custom regulators, guages and repair/rebuilds;    

Knibbs/got all the BSA parts (UK);

Best Fittings/lots of pcp stuff (UK):

Predator/ebay seller of kits and some aftermarket parts (UK):

Airguns of Arizona/former importer, may still have a few parts or do repairs:

Pyramid Air/importer of current BSA products:

BSA Owner Group Forum (UK)/lots of advice, help, and referrals to repair in the UK:


Posted on

Sheridan Bolt Lug Tool (how to make and how to use it)

This was really a kind of test video to see if we could make one, edit it to reasonable length, and upload it to our YouTube channel. And it worked!!! You can make this tool, but also offers them for sale if you’d prefer. And this is the first attempt at embedding video here on the webpage. Hope you enjoy the video and find it useful;


Posted on

Benjamin pump-up air rifle; How it works demonstration

I had an old ‘beater’ Benjamin 312, actually several, and so decided to sacrifice one to demonstrate the inner workings of this classic pneumatic air rifle. There are two videos, only to keep each within a 15 minute time frame. Most vintage and even modern pneumatic airguns operate in a similar manner, although the innards and specific mechanisms may differ substantially. I hope these videos are entertaining and informative.