A MOC - Kragled
Re: First pics of the brick AR-15 stock
How is Kragle working? Have you tried a solvent like acetone that melts ABS plastic or ABS cement?
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- Noble Citizen
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Re: First pics of the brick AR-15 stock
I tried ABS cement, but used too much of it & found it melted tiles in alarming ways. I wasn't pleased w/ the results. Loctite Plastic Epoxy sets too fast, and JB Weld is a mess, and you can't be sure you're mixing it in the correct ratio. (1:1) I tried super glue on this last part, and other than nearly sticking to the tube myself, I think it's probably the easiest to work with. I plan to shoot it this week, so we'll see how it holds up.
ETA: Super Glue is also quite cheap. I'll likely only use 2 part epoxies in the future when I need bulk, such as around a carbine buffer tube. It's also, apparently, evil, which makes it mo' bettah, right?
ETA: Super Glue is also quite cheap. I'll likely only use 2 part epoxies in the future when I need bulk, such as around a carbine buffer tube. It's also, apparently, evil, which makes it mo' bettah, right?
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- Noble Citizen
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Re: First pics of the brick AR-15 stock
Cragelized for the upcoming 00 buck torture test, back to Version 5A:
http://www.feinsteinproject.org/loes/ef ... gVer5A.jpg
http://www.feinsteinproject.org/loes/ef ... gVer5A.jpg
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- Noble Citizen
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- Honored Citizen
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Re: First pics of the brick AR-15 stock
Sounds like a good toy for kids to play with. Well done.
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- Noble Citizen
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Re: First pics of the brick AR-15 stock
I think of it more as a bonding opportunity for parents & their children - depending on who's holding the Kragle, it can be more or less of a bonding experience ; )
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- Noble Citizen
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Re: First pics of the brick AR-15 stock
Well, the moment quite a few of y'all have been waiting for: failure!
On the 2nd round of 12 ga 3" 00, the lower part of the 5C stock sheared off the top part; unfortunately for my shoulder, I didn't stop shooting 'til the 8th round. Ouch!
The video: http://www.feinsteinproject.org/loes/ef ... eTake5.mp4
For comparison, here is the much longer, heavier, and sturdier Ver 5B, running 30 rounds of 2.75" 00 buck:
http://www.feinsteinproject.org/loes/ef ... eTake4.3gp
Pics of 5C failure points:
http://www.feinsteinproject.org/loes/ef ... r5cAar.jpg
Note in this picture, the Kragle held - but the bump sheared off clean under the recoil:
http://www.feinsteinproject.org/loes/ef ... ailure.jpg
http://www.feinsteinproject.org/loes/ef ... cShear.jpg
http://www.feinsteinproject.org/loes/ef ... ailure.jpg
Some reinforcement will go here. Instead of using a brick in the column, I'll use several plates, some of which will anchor the 4x4 inverse slope brick:
http://www.feinsteinproject.org/loes/ef ... cement.jpg
http://www.feinsteinproject.org/loes/ef ... ailure.jpg
http://www.feinsteinproject.org/loes/ef ... embled.jpg
Glue for the stock itself was a generic super glue. The glue between the mil-spec tube and the stock was JB Weld 2 part epoxy; due to some voids in the bricks, that is the glue you see that has bled through the top part.
Technical suggestions appreciated. My current plan of action, suggested by Zuzzy on Weaponeer.net, is to lengthen the column by one brick, creating a vertical shaft. Interlaced through there I'll run plates w/ center holes, then run a screw from top to bottom. Following gluing of the stock, I'll tighten that down. Then the 2-part epoxy will be added into the buffer tube well, of which the top of the bolt will be at the rear. The buffer tube will then be pressed up against the bolt, and the 2-part epoxy will fill in the voids in the stock and in the bottom of the buffer tube where the normal stock lugs go.
On the 2nd round of 12 ga 3" 00, the lower part of the 5C stock sheared off the top part; unfortunately for my shoulder, I didn't stop shooting 'til the 8th round. Ouch!
The video: http://www.feinsteinproject.org/loes/ef ... eTake5.mp4
For comparison, here is the much longer, heavier, and sturdier Ver 5B, running 30 rounds of 2.75" 00 buck:
http://www.feinsteinproject.org/loes/ef ... eTake4.3gp
Pics of 5C failure points:
http://www.feinsteinproject.org/loes/ef ... r5cAar.jpg
Note in this picture, the Kragle held - but the bump sheared off clean under the recoil:
http://www.feinsteinproject.org/loes/ef ... ailure.jpg
http://www.feinsteinproject.org/loes/ef ... cShear.jpg
http://www.feinsteinproject.org/loes/ef ... ailure.jpg
Some reinforcement will go here. Instead of using a brick in the column, I'll use several plates, some of which will anchor the 4x4 inverse slope brick:
http://www.feinsteinproject.org/loes/ef ... cement.jpg
http://www.feinsteinproject.org/loes/ef ... ailure.jpg
http://www.feinsteinproject.org/loes/ef ... embled.jpg
Glue for the stock itself was a generic super glue. The glue between the mil-spec tube and the stock was JB Weld 2 part epoxy; due to some voids in the bricks, that is the glue you see that has bled through the top part.
Technical suggestions appreciated. My current plan of action, suggested by Zuzzy on Weaponeer.net, is to lengthen the column by one brick, creating a vertical shaft. Interlaced through there I'll run plates w/ center holes, then run a screw from top to bottom. Following gluing of the stock, I'll tighten that down. Then the 2-part epoxy will be added into the buffer tube well, of which the top of the bolt will be at the rear. The buffer tube will then be pressed up against the bolt, and the 2-part epoxy will fill in the voids in the stock and in the bottom of the buffer tube where the normal stock lugs go.
Last edited by backbencher on Wed Jun 04, 2014 7:01 pm, edited 1 time in total.
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- Noble Citizen
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Re: First pics of the brick AR-15 stock
The current plan of attack is to use two orientations, like this:
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- Noble Citizen
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Re: First pics of the brick AR-15 stock
Today's work. This design can take up to 8 screws, 3 of which run the height of the butt.
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- Noble Citizen
- Posts: 86
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- Location: Texas
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- Noble Citizen
- Posts: 86
- Joined: Sun Mar 31, 2013 9:33 pm
- Location: Texas
Re: First pics of the brick AR-15 stock
The very finest Harbor Freight Chinese Kragle was used, as usual. The threaded rods are from Lowe's - 6" 10-24 threaded rod. Production will probably be from Fastenall or Grainger.
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- Honored Citizen
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Re: First pics of the brick AR-15 stock
Should let your kid bring that to school.
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- Noble Citizen
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Re: First pics of the brick AR-15 stock
With 8 threaded rods Kragled, and 2 part epoxy locking the buffer tube in against the top of 3 of the rods, 24 rounds of 3" 12 ga 00:
http://www.feinsteingewehrwerke.com/loe ... s003in.3gp
http://www.feinsteingewehrwerke.com/loe ... s003in.3gp
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- Noble Citizen
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Re: First pics of the brick AR-15 stock
Here's the initial draft of the instruction manual:
http://www.feinsteingewehrwerke.com/loe ... sVer1.html
I'll get a proper parts list up in a week or so. The threaded rods are 10-24 - I'll try to get the metric equivalents, as well as the exactish length measurements they need to be cut to.
http://www.feinsteingewehrwerke.com/loe ... sVer1.html
I'll get a proper parts list up in a week or so. The threaded rods are 10-24 - I'll try to get the metric equivalents, as well as the exactish length measurements they need to be cut to.
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- Noble Citizen
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Re: First pics of the brick AR-15 stock
Some pics of Effort Forend:
Heat shield isn't installed in the brick lower handguard, and they're not glued.
http://www.feinsteinproject.org/loes/ef ... orend.html
Heat shield isn't installed in the brick lower handguard, and they're not glued.
http://www.feinsteinproject.org/loes/ef ... orend.html
Re: First pics of the brick AR-15 stock
Will the ABS melt?
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- Noble Citizen
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Re: First pics of the brick AR-15 stock
That remains the problem w/ the handguard. Typical AR handguards are aluminum, or high temperature plastics. There's also an aluminum heat shield that goes between the plastic and the bbl. I don't have one of those inserted at the moment on the bottom brick handguard, as I was just trying to see if it would fit, and if it would stay in position unglued. I"m quite sure a number of pieces would fall off of it right now if I fired it - though I have an idea of gluing 1x1 bricks or bbls on the ends, and holding all the rest of the structure under compression - and flexible. The stock kit, however, is stable once glued, and in production.
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- Noble Citizen
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Re: First pics of the brick AR-15 stock
Revised instructions for the Mk8 entry length stock. Broken down into 21 pages for easier viewing:
http://www.feinsteingewehrwerke.com/loe ... Ver1A.html
http://www.feinsteingewehrwerke.com/loe ... Ver1A.html
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- Honored Citizen
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Re: First pics of the brick AR-15 stock
Can you make a version that will pass metal detectors?
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- Noble Citizen
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Re: First pics of the brick AR-15 stock
If it's not glued together, I don't see what the TSA is going to say about a collection of plastic bricks & some threaded 10-24 rods. Once it's glued, it's a rifle stock, and should be shipped in your checked luggage. An X-Ray or physical search is going to see the 1" diameter threaded aluminum AR buffer tube sticking out of the stock rather clearly, as you can see on the last page of the instructions: http://www.feinsteingewehrwerke.com/loe ... APg21.htmlstevebuscemi wrote:Can you make a version that will pass metal detectors?
Defense Distributed designed a 3-D printed plastic pistol that could evade metal detectors, albeit a metal detector turned up to the highest setting will still detect metal bullets. As they printed theirs, they added the requisite piece of metal to meet Federal law. The point of the Feinstein Project http://www.feinsteinproject.org/ is not to make an undetectable firearm - it's to make a working AR lower receiver, that would still require a metal barrel to contain the 50,000 PSI pressures of .223" Remington ammunition.
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