AR Underfolder Adapter for Pistol Buffer Tube?

Tihsho · Aug 12, 2016

snallygaster said:
I've got several side folders if that's of any benefit.

Under folders would be what I need, side folders have different hardware. Thanks though!

DutchV said:
Of course, to make this really work, you're still going to need a stubby receiver extension and modified buffer, new springs, etc.

Well for the first iteration, probably not. Why? Because I'm not trying to clone the setup 100% just yet. Just looking to get the stock function setup. There are a few stubby receiver extensions out on the market, so why reinvent the wheel until I need to?

Drmsparks · Aug 12, 2016

I don't see why you couldn't use a standard pistol buffer and tube.....

DutchV · Aug 12, 2016

Drmsparks said:
I don't see why you couldn't use a standard pistol buffer and tube.....

Standard pistol tube is the same length as a carbine (M4) tube. At that size, folding the stock wouldn't make the package any shorter.

Boss94 · Aug 12, 2016

I'd just machine a shorter tube and loose the buffer that's what he did. I have done that on 3 9mm builds with no issues so far. It does require weighting the carrier . But not a big deal if you know you way around a lathe and mill .

Bertfish · Aug 31, 2016

Boss94 said:
I'd just machine a shorter tube and loose the buffer that's what he did. I have done that on 3 9mm builds with no issues so far. It does require weighting the carrier . But not a big deal if you know you way around a lathe and mill .

So what did he do to lose the buffer? Go to one of those captured buffer springs?

Boss94 · Aug 31, 2016

He weighted his carrier then mounted the buffer rubber piece to the rear of the carrier. By doing so you get rid of the buffer, and thus shorten your buffer tube by a good 4 inches.

cap6888 · Aug 31, 2016

Just thinking out loud here....

If you ordered this...

http://www.theflatspot.net/polish-ak-underfolder-rear-trunnion--tang.html

And then bought/fabricated a small sleeve to fit over the buffer tube. Then welded the sides of the flat to that sleeve. And then finished it up nice. How would that work?

I am not a machinist. But I have a Dremel and JB Weld.

Bertfish · Aug 31, 2016

cap6888 said:
Just thinking out loud here....

If you ordered this...

http://www.theflatspot.net/polish-ak-underfolder-rear-trunnion--tang.html

And then bought/fabricated a small sleeve to fit over the buffer tube. Then welded the sides of the flat to that sleeve. And then finished it up nice. How would that work?

I am not a machinist. But I have a Dremel and JB Weld.

What I was thinking about was just getting a trunnion to get the measurements off of. I'd like to keep it simple and just preserve the traditional AK mechanism. The picture in the OP seems to be a newly made mechanism.

cap6888 · Aug 31, 2016

Bertfish said:
What I was thinking about was just getting a trunnion to get the measurements off of. I'd like to keep it simple and just preserve the traditional AK mechanism. The picture in the OP seems to be a newly made mechanism.

Were you planning on machining a piece? The OPs original pic is awesome. I wish there was info on how it was made.

Bertfish · Sep 1, 2016

cap6888 said:
Were you planning on machining a piece? The OPs original pic is awesome. I wish there was info on how it was made.

While I have machining knowledge I am unfortunately not a machinist. I do know people with 3D printers, though, so I could try my hand at a design and print a prototype.

Matlack · Sep 1, 2016

I can think of 2 ways to do this. If anyone wants to pay for a prototype I can go to machine shop to get one made.

Bertfish · Sep 1, 2016

Anyone have a trunnion laying around they wouldn't mind parting with? Only one I have is in a rifle...

Bertfish · Sep 1, 2016

I don't want to steal the OP's thunder. I just think I may have finally found something cool that I can apply my skills to which overlaps my firearms hobby.

cap6888 · Sep 1, 2016

Matlack said:
I can think of 2 ways to do this. If anyone wants to pay for a prototype I can go to machine shop to get one made.

Cost?

Matlack · Sep 1, 2016

cap6888 said:
Cost?

No idea at the moment. I need to make a production drawing and get a quote.

Bertfish · Sep 1, 2016

Matlack said:
No idea at the moment. I need to make a production drawing and get a quote.

If I can get a trunnion to measure I can get an idea together with Solidworks

Tihsho · Sep 1, 2016

Keep me posted on this guys. Have not lost interest, more so just time to actually spend on design with some recent events that have been taking up my time.

cap6888 · Feb 11, 2017

I am resurrecting this thread in the hopes that maybe someone made some headway with this. I did end up adding the underfolder stock to an order, so I have one laying around in case this can be done. I am hoping in the next month or so for my stamps to come back, I would love to use this on an SBR build.

Boss94 · Feb 12, 2017

I started drawing it up and got sidelined. Maybe in a month or 2 I can get back to it.

cap6888 · Feb 14, 2017

Boss94 said:
I started drawing it up and got sidelined. Maybe in a month or 2 I can get back to it.

Would love to see this work out. I can donate the folding stock to the project.

AR Underfolder Adapter for Pistol Buffer Tube?

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