Short Barrel Rimfires - chassis design and choice?

Jahnj0584

Jahnj0584

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I just got my Scorpio EM332 13" the other day and shot it once. I don't like the thumbhole stock, but I do like the more vertical grip to rest my fingertips on. Before I ordered, I knew I'd eventually want to re-make a stock for it. I'm currently taking suggestions and inspirations on what to make! I have access to a CNC router at home, a 5 axis CNC mill at work, and a 3D printer.


Priority #1 is adjustable cheek riser. I need something flush with the top of the action to get any cheek weld for this gun, scoped. Because of this, the 10/22 magpul or Bergera b14 stocks are looking good to me.

Not sure yet if I make it out of hardwood, synthetic polymer, or straight up plastic. Depends a lot on what the final design is, and if I want to paint it camo (akin to the CZ trainers). REALLY can't decide if I want to turn this into a mobile target rifle, or a small game hunter. That will also have some impact on the design. Worst case, I make both :cool:

Appreciate any and all input on this!

PS: I've already gone through the 10/22, CZ, and show-off thread on here as well.


 
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I was actually exploring the idea of a short (in barrel and overall length) rimfire bolt action rifle and I noticed that there is a lack of options for short barrels and chassis for models other than the Savage MKII and CZ 457, and compared to aftermarket semi rimfire options like the 10/22.

There are multiple options depending on the direction you want to go in. If you want a target style rifle I would go for a nice wood stock that is based on traditional styles. I don't need to beat a dead horse there. What I would be more interested in is the lightweight game rifle in a modular chassis (like the Grey Birch rifles or the chassis offered by Spectre Ballistics). I think if you went for a proof of concept in a 3D printed example it could be the beginning of a product that other people could also be interested in.

I was exploring going in this direction myself but wasn't sure about the quality of the Scorpio. Would you recommend it as a starting rimfire bolt rifle?
 
Fisselig said:
wasn't sure about the quality of the Scorpio. Would you recommend it as a starting rimfire bolt rifle?
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Hard to say on your behalf since I don't know what your budget is, expected quality and precision, shooting conditions, etc. It's a cheap-as-dirt Chinese rifle, it's assumed you'll have to soften a few sharp edge and burrs and let it wear in to become smooth. No gun will outshoot bad bulk ammo. Are you ok with spending 25c+ a round on match ammo instead of .10 for bulk? Do you care about passing the 1/2 challenge or just like punching holes for fun? Lots to think about!
 
I found this cool CZ on the thread, and scaled it all to fit this gun's action. Not sure how I feel about the humpback section behind the striker.


 
If these are roughly the same dimensions/bolt spacing as an Anschutz Model 54 then they might be made to fit into a Tikka chassis.
 
Jahnj0584 said:
Hard to say on your behalf since I don't know what your budget is, expected quality and precision, shooting conditions, etc. It's a cheap-as-dirt Chinese rifle, it's assumed you'll have to soften a few sharp edge and burrs and let it wear in to become smooth. No gun will outshoot bad bulk ammo. Are you ok with spending 25c+ a round on match ammo instead of .10 for bulk? Do you care about passing the 1/2 challenge or just like punching holes for fun? Lots to think about!
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I mean at the end of the day if it can be used to hit a popper at 50m with boring regularity out of the box, shut up and take my money!
 
I toyed with the idea of cutting the butt stock off and adding an AR buffer tube and collapsible stock to the original. Might need to add some JB weld in the back of the plastic stock to reinforce where the buffer tube threads in though.
Kristian
 
If you have access to all that machinery and the skills to operate it, why not design an aluminum chassis that serves as a bedding block, and surround it by a clam shell 3d printed plastic stock. You could make more than one version of the outer shell, must like an AICS chassis has different outer skins, some aftermarket with added features.
 
Grizzlypeg said:
If you have access to all that machinery and the skills to operate it, why not design an aluminum chassis that serves as a bedding block, and surround it by a clam shell 3d printed plastic stock. You could make more than one version of the outer shell, must like an AICS chassis has different outer skins, some aftermarket with added features.
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Neat idea.
1) i have wood that is essentially free to use
2) i intend to hunt small game eventually
2b) during the winter months
3) it's much easier to only program the inletting on my wood router and hand carve the grips and contours then dealing with creating a perfect model and then spending a few hours on the CAM to get a mill to process all of it in 3+ operations + setting up after work.
 
I'm pressing forward. New rings (allegedly lower) arrive tomorrow. Will design and 3d print a trigger guard in the morning

6.4lbs with bipod!




 
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Best group today was .6" at 50y with CCI SV. Shot about 100-150rds at 50/100y for fun. The increased comb is pretty comfortable. Ideally the buttpad would be an inch lower, but we'll see if it bothers me enough to make another one.

Overall, I give it a personal rating of 9/10 with the asterisks of being a one weekend project. First time using spray paint for anything beside refreshing target faces.

In hindsight I wish I had bought brown to lay under the black stripes, but c'est la vie.

 
So you used two boards and laminated them together, interesting.
Would be much easier to inlet this way for those working with basic hand tools. This gives me ideas for winter projects...
 
Jahnj0584 said:
I just got my Scorpio EM332 13" the other day and shot it once. I don't like the thumbhole stock, but I do like the more vertical grip to rest my fingertips on. Before I ordered, I knew I'd eventually want to re-make a stock for it. I'm currently taking suggestions and inspirations on what to make! I have access to a CNC router at home, a 5 axis CNC mill at work, and a 3D printer.


Priority #1 is adjustable cheek riser. I need something flush with the top of the action to get any cheek weld for this gun, scoped. Because of this, the 10/22 magpul or Bergera b14 stocks are looking good to me.

Not sure yet if I make it out of hardwood, synthetic polymer, or straight up plastic. Depends a lot on what the final design is, and if I want to paint it camo (akin to the CZ trainers). REALLY can't decide if I want to turn this into a mobile target rifle, or a small game hunter. That will also have some impact on the design. Worst case, I make both :cool:

Appreciate any and all input on this!

PS: I've already gone through the 10/22, CZ, and show-off thread on here as well.


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Regarding Cheek weld; if you can, lose the clamp on rail, get a good set of low dovetail mounts; you have room below your front scope bell; just make sure the bolt handle still clears it. I did not mind the thumb-hole stock on my "long" version of this rifle; it did fit the action poorly, and I did bed it using JB Weld Plastic; it was moving in the stock forwards and backwards by a bit more than 1MM. If I had kept it, I would have added extra weight inside the butt-stock, but with the short barrel, this should balance very nicely. It should not be too difficult to make one. Mine was very accurate, but I replaced it with a Brno no 2 with a magnificent piece of highly figured walnut. Also very accurate. Have fun with it, good rifle and the price is right!!
 
Jahnj0584 said:
I found this cool CZ on the thread, and scaled it all to fit this gun's action. Not sure how I feel about the humpback section behind the striker.


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I like it. Again, scope could be lowered by losing the rail and using low dovetail mounts. No rear sight to clear.
 
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