Brugger + Thomet APC223 / APC9 - ACR Buttstock Adapter

Bartok5

Bartok5

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Hey Fellas,

I thought that there might be some interest in finally being able to acquire a Buttstock Adapter that allows you to replace the OEM APC223 and APC9 Buttstock with the Bushmaster ACR version. The B+T Buttstock's fixed-length and especially the lack of a Cheek-Riser for optics use are the major complaint of APC system owners. The Buttstock aside, the B+T APC firearms are extremely well-made and are otherwise outstanding in near-every regard. But let's face it - the stock APC Buttstock sucks donkey balls. Now, after an interminable wait there is finally a fix.

The company in question is "Dan Haga Designs": www.danhagadesigns.com

The APC to ACR Buttstock Adapter is $90. They are made out of a laser-sintered, dense plastic produced on a $200K HP Multijet 3D printer. The dimensions are perfect for a snug fit with zero wobble. Although long-term durability is unknown, if treated with basic care the Adapter ought to provide many years of service. I highly recommend this adapter, but at the same time I encourage you to ask Dan to produce an Aluminum version in the future. That would take tons of abuse for those who like to torture-test their kit.

Before (with my home-brewed kydex cheek-riser)


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After:


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"Excessive opening and closing of the stock will cause wear that can remove the black paint & dye exposing the white nylon below."

Hard pass. Maybe if it was Aluminium....
 
I can happily live with a bit of cosmetic wear, so long as that is where it ends. Dimensional wear to the nylon material of the Hinge itself due to occasional use would be a disappointment. I don't expect that to be the case, but you never know - hence my request to ençourage Dan Hagan to make an aluminum version. The material looks and feels completely different from the much more fragile "layered" plastics that I háve seen used for magazine extensions, etc. I don't mind a $150 risk as that is the cost of progress - someone has to support the type of innovation that we all want to see. The manufacturer hss successfully conducted drop-testing, so the printed part is quite capable of taking some abuse. Of course it is not as durable as machined Aluminum, but the ACR Stock really does completely change the feel of my B&T carbine for the better!
 
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Evogun said:
I would use metal 3D parts, the machines that do this correctly cost 250K+ like this one https://www.okuma.com/mu-8000v-laser-ex and yes they can be used on guns.
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and still needs some post work. those machines are well over 250k as well (same for the matsuura lumex). 3d printing of any kind is basically useless for this component. there is no value added to the customer and the finish product in many instances ends up significantly more expensive than just making it via conventional methods vs additive manufacturing at this time. A powder fill for a machine like that is a lot, I know a ti fill was over 100k... no value added unless your product warrants it (low vol high mix for instance).

just mill it. maybe in the future the tech will be front and center but for now, AM isn't a good option.
 
The exterior finish is excellent - smooth, with none of the striations or "layers" like the cheaper 3D-printed mag extensions out there. Furthermore, the plastic used seems to be very dense. I'm guessing that perhaps the printed adapter was tumbled or bead-blasted to get the matte exterior texture.

The ACR Stock Adapter is excellent design work. All of the lines and contours match up precisely. This is a solid, thick piece of work, not a fragile or cheap print-job. Not by a long stretch. At least this way, the polymer latch and hinge of the stock is not bearing against an Aluminum interface which could cause accelerated wear of the softer polymer material. With the Plastic adapter you get plastic wearing against polymer - it seems a better match to me, just like the original polymer parts.
 
Nice rifle bartok... :)

Armedsask said:
Loan me stock and gun, I make.

3D printed parts do not belong near guns.
Click to expand...

I'd rephrase that... "3D (insert cheap/weak plastic name here) parts don't belong near guns".

With cheap (accessible) additive process printers, and the abundance of software, and low price of PLA/PETG/ABS plastic, more and more people are designing prototypes if parts using "3d printed parts". When one gets the part they wish, they can simply send the design to be milled from Al, Fe, Steel, Ti, etc.

I'm currently making a stock adapter for my M88, and it would end up costing me alot if I had this done externally.... right now, my first 15 versions (lol) cost me less than 5$, which is extermely cheap for the "R&D" part.

When I get the perfect adapter, I'll have it made from aluminium, steel, or titanium.

I'm not sure how the "end" adapter will be like on mine, it will depend on the stock I want to attach to it. I might end up making a receiving end of a zhukov stock from the cz858 rear receiver.

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Bartok5 said:
The exterior finish is excellent - smooth, with none of the striations or "layers" like the cheaper 3D-printed mag extensions out there. Furthermore, the plastic used seems to be very dense. I'm guessing that perhaps the printed adapter was tumbled or bead-blasted to get the matte exterior texture.

The ACR Stock Adapter is excellent design work. All of the lines and contours match up precisely. This is a solid, thick piece of work, not a fragile or cheap print-job. Not by a long stretch. At least this way, the polymer latch and hinge of the stock is not bearing against an Aluminum interface which could cause accelerated wear of the softer polymer material. With the Plastic adapter you get plastic wearing against polymer - it seems a better match to me, just like the original polymer parts.
Click to expand...
You know - I'm starting to think if my APCs had this stock adapter I might have had more love for them before I sold em!

Pretty cool what you can do with 3D printing these days.
 
I think 3D printed parts have their place but it's mostly for the R&D part like tharkhold suggests. Get a working prototype then have it made from quality material.
This all depends on the application though, some stuff needs to be strong and should be made of a more appropriate material once the prototype is perfected and other stuff that carries no load can stay as the cheap plastic piece. A stock adapter is one place I'd want it to be made from Aluminum or whatever stronger material.

I have a gen 2 Kriss Vector and the silly little stock adapter they made is definitely a weak point. I broke one already and they're not cheap to replace. I'd love to see an aluminum version of that piece.
 
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