• This Forum is for adults 18 years of age or over. By continuing to use this Forum you are confirming that you are 18 or older. No content shall be viewed by any person under 18 in California.

BSA Martini MKIII

hdskip

Silver $$ Contributor
I recently acquired a Martini MKIII barreled action. At the time I knew very little about them and had never seen one. With some searching I soon realized that finding parts for these was going to be less than fruitful. I had no desire to modify the action so I started a search through my parts bin to see what was on hand. A piece of plastic cutting board, some steel and aluminum, and an A2 AR stock became basis for what was needed. I devised and fabricated an adapter to mate with the rear of the action using the stock bolt threaded hole. I then added a shaft to that that the AR stock would slide on. For a fore end I made what is a bag rider with a shaft and part of a plastic cutting board. So I achieved the goal of a shootable rifle with out modifying the action and did it at minimal cost as well. I also fabricated the scope mount that utilized the mounting holes for the original receiver sights the rail was one I had in my parts bin also.
 

Attachments

  • MKIII-2.jpg
    MKIII-2.jpg
    23 KB · Views: 103
  • MKIII-1.jpg
    MKIII-1.jpg
    44.2 KB · Views: 82
  • MKIII-5.jpg
    MKIII-5.jpg
    84.5 KB · Views: 81
  • MKIII-6.jpg
    MKIII-6.jpg
    202.7 KB · Views: 86
  • MKIII-4.jpg
    MKIII-4.jpg
    84.2 KB · Views: 100
  • MKIII-3.jpeg
    MKIII-3.jpeg
    311.8 KB · Views: 104
Last edited:
It is very close to proper alignment. Future plans may include some sort of adjustable comb arraingement. Truth is, so far it is proving very accurate. It is also a lot of fun.
 
I'm curious to see what you did to anchor your aluminum stock mounts to the receiver, both fore and aft.
I'm a fan of 'using what you got', you seem to have an efficient solution to get yourself up and running.

You might be able to add a spent shell deflector to your scope mount. The ejectors on these are 'aggressive', your bench neighbor to the right will appreciate it..
 
Last edited:
The anchor bolt was drilled at the proper angle to make the comb parallel to bore of the barrel. The extension was attached with a screw in stud. The extension was bushed on both ends with nylon bushings sized to fit the bore of the stock. The stock was fastened to the extension through the butt plate. Everything is connected and is extremely solid. This was a challenging project but everything used in it came from parts and material on hand in my small shop.
 
I'm curious to see what you did to anchor your aluminum stock mounts to the receiver, both fore and aft.
I'm a fan of 'using what you got', you seem to have an efficient solution to get yourself up and running.

You might be able to add a spent shell deflector to your scope mount. The ejectors on these are 'aggressive', your bench neighbor to the right will appreciate it..
Yes those ejected cases do "fly" a ways, the MkII I used also had this problem it could fling them 2 benches away.
 
Thanks for the info on the butt stock. Even better that it's available in left hand...... That may be a good cold weather project!
 
I recently acquired a Martini MKIII barreled action. At the time I knew very little about them and had never seen one. With some searching I soon realized that finding parts for these was going to be less than fruitful. I had no desire to modify the action so I started a search through my parts bin to see what was on hand. A piece of plastic cutting board, some steel and aluminum, and an A2 AR stock became basis for what was needed. I devised and fabricated an adapter to mate with the rear of the action using the stock bolt threaded hole. I then added a shaft to that that the AR stock would slide on. For a fore end I made what is a bag rider with a shaft and part of a plastic cutting board. So I achieved the goal of a shootable rifle with out modifying the action and did it at minimal cost as well. I also fabricated the scope mount that utilized the mounting holes for the original receiver sights the rail was one I had in my parts bin also.

Nice job. I really like your scope mount and nice pic rail! Let the shooting begin.
Paul
 

Upgrades & Donations

This Forum's expenses are primarily paid by member contributions. You can upgrade your Forum membership in seconds. Gold and Silver members get unlimited FREE classifieds for one year. Gold members can upload custom avatars.


Click Upgrade Membership Button ABOVE to get Gold or Silver Status.

You can also donate any amount, large or small, with the button below. Include your Forum Name in the PayPal Notes field.


To DONATE by CHECK, or make a recurring donation, CLICK HERE to learn how.

Forum statistics

Threads
164,684
Messages
2,182,648
Members
78,476
Latest member
375hhfan
Back
Top