PRS oriented stock design
- Thread starter Mr.BR
- Start date
Was playing around with loggerhead clamp design on the mockup, but its taking too much real estate (LOP top rod is hitting cheek hardware) as the stock is shorter than most stocks and the cheek rest a bit more rearward than most stock out there.Excellent choice of clamping system for the LOP and Adjustable Cheek Rest!
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My default mechanism with 2part clamp used in number of my stocks
Tried Loggerhead in both cheek and LOP as is much shorter , but unfortunately still interferes with LOP too much so a more compact design will need to be made to increase the LOP adjustment range
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At some stage you hit the limits of 3d design particularly when it comes to ergonomics, so we did some 6 or 7 new thumb shelf and tang area design iterations, including a bunch molded in plasticine to get the right feel for the shape
Had some friends over that design and build low-vibration carbon fiber arms for industrial robots etc took some of their input into how best to manage vibration dampening.
Structurally better grip area that also feels better,the removable grip insert was also reshaped to increase the stiffness of the whole section. Ultimately swappable grip shapes and sizes are nice to have but should not compromise the design elsewhere. Rigidity is key.
Fingers crossed this is near final only small details to work out.
Plasticne shaping
Green is new , gray old
Had some friends over that design and build low-vibration carbon fiber arms for industrial robots etc took some of their input into how best to manage vibration dampening.
Structurally better grip area that also feels better,the removable grip insert was also reshaped to increase the stiffness of the whole section. Ultimately swappable grip shapes and sizes are nice to have but should not compromise the design elsewhere. Rigidity is key.
Fingers crossed this is near final only small details to work out.
Plasticne shaping
Green is new , gray old
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Looks like prototype tooling for the rimfire stock might get machined over the weekend.
Meanwhile, CZ opened up their databank of interface data and CAD files that should help aftermarket developers, its great that a firearms manufacturer finally did that ,but still some more files would be great and in English so folks know what is what without opening every file.
https://www.czub.cz/en/connection-i...mxdArRB2ShNW1uIMWM1UFqHe79kYNx93DGWdMYR-RpiQg
So with the inlet available i can do CZ457 stock variant rather quickly
Some render tryouts for new forged carbon pattern
Meanwhile, CZ opened up their databank of interface data and CAD files that should help aftermarket developers, its great that a firearms manufacturer finally did that ,but still some more files would be great and in English so folks know what is what without opening every file.
https://www.czub.cz/en/connection-i...mxdArRB2ShNW1uIMWM1UFqHe79kYNx93DGWdMYR-RpiQg
So with the inlet available i can do CZ457 stock variant rather quickly
Some render tryouts for new forged carbon pattern
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MDF tooling for a prototype stock is machined ,now couple of days to get the mold finished to a gloss finish befroe actual stock can be molded.
First coats of polish in
First coats of polish in
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There is one stock close for this in South Africa.
Carbonfiber etc, so it is nice to see a new one coming too.
Carbonfiber etc, so it is nice to see a new one coming too.
Interested to see the finished product here... There is such an overwhelming demand for stocks, especially for PRS. I personally am not a chassis guy and clearly I'm not the only one that prefers the feel of a more traditional stock. Hope this project goes well for you, it could be the start of something great
The Anschutz model is kinda for personal use and i think A64 is already discontinued,its also a bit of a mule to test some build options, but soon after a Rem700 model will be made for serial production while this design might end out being recycled for CZ457 and Anschutz 54:18
Dabling a bit around the forend bridge design, while working on the stock mould. Bridge It will be compression molded out of carbon fiber as well. If all goes well first stock should be laminated next week .Hope metal parts get done soon.
Dabling a bit around the forend bridge design, while working on the stock mould. Bridge It will be compression molded out of carbon fiber as well. If all goes well first stock should be laminated next week .Hope metal parts get done soon.
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Now that the provisional tooling is impregnated solid its time for wax on, wax off process of applying the release wax. hope to laminate first stock in 4-5 days
A tiny update , still waiting for my Bergara barrelled action to act as a mule for Rem700 , so work is only moving on Anschutz stock
First molding happened but unfortunately suffered a technical malfunction during the process so part was scraped, after minor repair now rewaxing the tool for second molding thankfully the damage to the tooling was minimal but still given its made out of MDF its extremely sensitive to dimwit's like me doing stupid shit . Should be up for molding again in about a week .
Metal bits came in , some work left to prep them and Cerkote them , Arca rails are tool steel , M-lok and QD rail are stainless steel.
First molding happened but unfortunately suffered a technical malfunction during the process so part was scraped, after minor repair now rewaxing the tool for second molding thankfully the damage to the tooling was minimal but still given its made out of MDF its extremely sensitive to dimwit's like me doing stupid shit . Should be up for molding again in about a week .
Metal bits came in , some work left to prep them and Cerkote them , Arca rails are tool steel , M-lok and QD rail are stainless steel.
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Meh, tool steel is an idiom, there's no spec for tool steel, basically if there is a tool made of steel that steel is now tool steel.
In general, i wanted the arca rail to be as stiff as possible was looking at least something like 4140 or stiffer
In the end, it will likely not make much of a difference anywhere but still will likely use at least 4140 for rails in the future, as these rails do overhang the stock so should be as stiff as possible. That is also the reason why i am avoiding use of Arca rails with pockets for brass weights
In the end, it will likely not make much of a difference anywhere but still will likely use at least 4140 for rails in the future, as these rails do overhang the stock so should be as stiff as possible. That is also the reason why i am avoiding use of Arca rails with pockets for brass weights
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Generic speak for "not mild steel, and can be heat treated.... probably".
Haven't updated this in a while
Anschutz and CZ stock is ready , Rem700 still some tweaking going on
* aside from 600g lead block in front of the stock most weight is internal and it balances between first two Mlocks ,even without a 1.2'' barrel contour
Anschutz and CZ stock is ready , Rem700 still some tweaking going on
* aside from 600g lead block in front of the stock most weight is internal and it balances between first two Mlocks ,even without a 1.2'' barrel contour
Very cool! It's awesome to see a product go from an idea, to a model, to 3d prints then to a real prototype. Good work!
What DBM cutout profile are you using in this stock right now?
This one is rimfire so has proprietary bottom metal ,an with Anschutz and CZ bottom metals can be quite a freestyle as there is no mag latch or even mag well in them , just a mag funnel and barricade stop.
Rimfire stock while it has slightly less aggressive 'stance' than that for Rem700 had a kinda particular goal to make factory barrel profiles work , as Anschutz and CZ are kinda small actions and hard pressed to carry the weight of a straight 1.2' barrel , at the same time 1.2' is not required for gun peak accuracy its just about balancing the rifle
The Rem700 variant Is badger M5 compatible so could fit MDT bottom metal.
Cant wait to get rem700 stock shooting , took some lessons from this one in regards to some production related optimizations .
Rem700 is somewhat more pain in the ass as i am also developing the bottom metal not just stock , probably overdoing it with having it adjustable in both magwell lenght and magazine latch height.
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CZ457 stock builds on experience gained in Anschutz stock design , M-locks to be integral to carbon fiber structure vs bolted on stainelss rails. Stock is designed to take large diameter aftermarket barrels while still having considerable space for internal weights . I reckon it will be able to balance out even with stock MTR barrels without any weights on M lock slots, but after market barrels of course would be ever better balanced.
Now moving back to Rem700 design , while CZ457 stock is slowly being prepared for serial production.
64MPR balances between frist two m-locks , even with whimpy factory barrel.
Now moving back to Rem700 design , while CZ457 stock is slowly being prepared for serial production.
64MPR balances between frist two m-locks , even with whimpy factory barrel.
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Struggling to see how the numbers add up here? What magic have you used to get the rifle that heavy without weights, or a long/heavy barrel yet be balanced like that.
Is the stock reasonably heavy just without too much weight in the rear?
Or are the a bunch of internal forend weights?
Its not without weights , the arca is steel , stock is built with front heavy fill and there are weights under the barrel like i said there are just no weights on the m-locks ,you can also see a weight on the front of the arca its the smallest one i made at 650g/23oz but even heavier ones can be used without impeding the function of the arca at any point , as its designed for bolt on accessories.
Weighed my Anschutz forend bits
Steel Arca & m-lock rails - 850g / 30oz
Internal under barrel weight 1150g/ 40,5oz - space left for further 150-200g
Front Weight 615g/ 21.7oz
Point i was trying to make is that the front balance was achieved with some reserves to spare even on a skinny barrel so i am confident i can achieve similar on stock CZ MTR barrel.. Of course fat barrels are preferred way to front balance.
Remember for us folks over the pond in 'Eurostans' barrel changes are less trivial(permits ,gunsmiths) and more expensive so enabling a balancing of stock barrels or typical prefits that are nowhere close to L3i barrel diameter was a factor.
Stock MTR barrel as you can see there is ample space for weights under the barrel .
Space under the barel fits a roughly 1kg/35oz steel or 1.3 kg/46oz lead weights , plus 600+g/21oz weight in front of the stock
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Ah that makes more sense.
Definitely impressed how heavy it is with that barrel, my T1x, in a Bravo with a heavy 26" barrel and a load of forend weights barely balances that well and is barely 8kg.
Long story short, looks like you've done a good job with the balance of it.
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