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Thread: DIY: $10 bump-fire AK stock
02-26-2012, 12:47 PM #1
DIY: $10 bump-fire AK stock
This is all legal, … yes, even in mAss. No gray areas or doubts, based on my research. This is an account of my experience meant for your entertainment only.
- IANAL. You may get sued for a lot of things, like taking a dump in your neighbor’s yard. Whenever you do, get a lawyer and I hope that your defense will be better than “this guy called Boris, on the internet, said it was OK.”
- I don’t have an ATF letter for this. They are very specific, down to dimensions. Change the screw length and you need another letter. Your firearms do not need an ATF letter of approval to be legal. It’s like asking your dad if you can use his stash of porn. I’m boiling down design on Fostech’s ATF letters of approval, minus dildos and plastic. Dimensions are not the same but the principle of operation is.
- There are quite a few patents filed in regard to bump-fire stocks. Original Akins’ had a spring … and ATF does not like springs of any kind, especially in a stock. Patent claims may be granted or not, if granted they may still be challenged or invalidated for a whole bunch of reasons like prior art etc. All that said, based on case law, it’s still up in the air if manufacture “not for other’s use” is indeed not an infringement.
- Bumpfire is not illegal … unless your club sais that it is on their property or your get Fudd attack. It’s like saying that you can **** with your “existing legal equipment” as long as you are making one thrust per three seconds. Trust me, your penis can not just go “full auto”.
NOW WE HAVE GOOD TIME
So I talk to Michael Timofeyevich Kalashnikov and he is all bullshit:
gd damn capitalists, they are making unlicensed copies of my avtomat, and attach sex dildos instead of buying many cartridge of ammunition to practice skills of shooting enemy in defense of most glorious Motherland
yeah, well I have to put up with all the ****ing threads on NES every week when people stumble on bumpfire stock on youtube and piss their panties: “ZOMG!!1!!! did you see that, is that legal, OMG, it’s like $500 and I want it so bad, I can’t wait until my girlfriend gives me my allowance this week !!!11!!1$500 ?!? you shit me comrade, you can build a whole bunch of AKs for that price. $500 to attach plastic bull shit that goes in-out?ok, tomorrow we build one for $10. I hope that comrades spend the rest of $490 on an AK kit and some tools … and may be an Ocelot.”
The foundation for the bump fire stock is railing that allows limited movement in-out without any springs and may not be readily modified to use one. It uses “isometric tension” of your stiff arm to reset the trigger, but you are still firing one shot per pull of the trigger.
I settled on 5/8” x 10” bolt. We cut its head and its threads. This may run you a couple of bucks.
For the other part of “railing” you need a piece of EMT conduit, I don’t remember the diameter, but it would fit perfectly over 5/8” bolt. It’s $1.50 for 10 feet.
Since we are replacing the stock … stock, we need to make something that would fit into AK’s receiver. I grabbed a bunch metal from scrap heap, stacked it up and welded it together. I also tapped 10-24 holes for screws to hold it in the rear trunnion.
Now we need to attach the rod to our “trunnion” I used a piece of ˝” square tubing to fill in some space in between, then weld … a lot.
Time to weld a bunch of crap to the tube. Again, I’m eyeballing scraps of metal and grinding them to size.
The front end gets a M6-1 thread drilled and tapped so that you can attach your regular AK pistol grip. That’s right, I tapped it metric style!
Lower assembly then looks like this. We are almost done.
The tube needs a cut. This cut will hold a rivet that prevent stock from flipping sideways and letting you shoot “hommie style”. It also limits stock travel.
The beefy stainless rivet permanently attaches the rod to the tube, preventing you from slipping a spring inside (i.e. “easily modifying it into a machinegun” – NO!!!)
Rivet is attached half-depth to allow free movement of rod inside of the tube. You are ready to mount the contraption.
At the backside, I drilled a couple of holes on the either side of the tube. The reason for this is that although rod does not have enough seal to create springy piston effect. Remember that spring assist is a no no, so we want to be proactive and make absolutely sure that there is no doubt that nothing will assist in stock return, spring or gas pressure.
No we go the range. We use the stock on RomyG and and Arsenal AKs.
Bumpfiring still requires some time to get use to. I don’t get it why you would want to piss away perfectly good rounds. So I am trying to get a hang of this:
passing this on to my comrade:
ShadyDuck had some wise words in regard to the limit of stock travel. The optimum travel is about 3/4 “, many thanks to Shady for his expertise and guesting me on his club’s range while I had to make the adjustment:
02-26-2012, 12:59 PM #2
- Join Date
- Dec 2011
Sweet!!! Awesome job, it performed well. A little bit of time to save ALOT of money!!
02-26-2012, 01:08 PM #3
02-26-2012, 01:13 PM #4
And I mean this in a really, really good way.
Do want !Politics is a dirty game. You wanna win ? Play dirty. It's for the children.
02-26-2012, 02:06 PM #5
Good job.! on a $300 POS AK, that's a great modification!Master Electrician
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02-26-2012, 02:08 PM #6
- Join Date
- Jan 2012
- MA & RI
Wow, props for this. Definitely beats the 300 dollar or so pricetag of the name brand bumpfire stocks. Good work!
02-26-2012, 02:10 PM #7
Every time I see something like this I have to ask "How is this legal in MA?" I would interpret this as a collapsible stock... so when it's combined with a pistol grip and detachable magazine, it's then an Assault Rifle by the ATF's definition.
Someone please tell me my train of thought is illogical... because I would love to build / have something similar."The greatest danger to American freedom is a government that ignores the Constitution." -- Thomas Jefferson
02-26-2012, 02:10 PM #8
02-26-2012, 02:11 PM #9
- Join Date
- Sep 2009
- your tight sphincter
02-26-2012, 02:15 PM #10
- Join Date
- Sep 2009
- your tight sphincter