Help me understand AK underfolders

Guys,

Maybe it's because I don't have one here to inspect or that I'm just not too bright, but I'm having a hard time understanding the mechanism behind the AK underfolders. Here's a diagram:

http://www.ak47videos.com/pic/0-0-00-Underfolder.jpg

So if I understand correctly, when you depress the button (1), locking nuts number (6) and (8) move out, unlocking the mechanism, until you open or close it, in which case they lock again due to the spring's tension (2)?

Or am I way off?

My brain's hurting, please help!

Yep thats how it works. There a little sloppy but myself and many others love em.

Yep thats how it works. There a little sloppy but myself and many others love em.
+1

Lock #(6) is located inside the receiver and rest against the receiver's inner left surface, while lock #(8) is located outside the receiver and rest against the outer surface of the receiver's right side. I have an underfolder, but personally I like fixed-stock rifles better.

-Dan-

Here is a video of the tear down.

http://www.youtube.com/watch?v=GgrQPr5ykCs

Thanks guys. How loose or stiff is 6 and 8 supposed to be so that they both lock properly and are not too hard to push out with the button?

Here is a video of the tear down.

http://www.youtube.com/watch?v=GgrQPr5ykCs
that video needs to be reshot. it's so grainy out of focus it's hard to see what he's doing.

Instructions for underfolder:

http://home.earthlink.net/~mwsjb/AKbuild3.htm

that video needs to be reshot. it's so grainy out of focus it's hard to see what he's doing.

+1

It sure made my folder installation easier back when I was doing mine ;) .

Thanks guys. Can anyone comment on relative looseness or stiffness of the locking mechanism?

Like Knall called it,

Variety of "tightness"... Some sloppy, some take them apart and rebuild them tighter than a crab's ass(for a little while)...

panzertruppe

Guys, how can a tight #8 be made less tight? A friend is building one (I'm helping, apparently) and that lock does not like to return to its hole in the trunnion and/or UF, and requires repeated strikes with a hammer to cover #7, in which case operation by button becomes impossible.

Would you recommend filing down the prongs of #8? Is there a better method?

Leave the prongs and any other parts of the stock alone.

Your problem MUST be misaligned receiver holes.

Always file grind destroy the part that can be replaced the cheapest.

The stock has "posts" and "holes" of its own. That interact w the rear trunion.


I am sure it works fine untill you put it into your reciever. modify the reciever NOT the stock.

Thanks Knall!

Leave the prongs and any other parts of the stock alone.

Your problem MUST be misaligned receiver holes.

Always file grind destroy the part that can be replaced the cheapest.



+1

Underfolder stocks always wear, and become sloppy loose, until it's hard to hit anything with them. If you can make the lugs tight enough that you need to hammer them in, then they're almost tight enough. Mine lasted about 12,000 rounds, before it started wiggling.