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/h/ - Hobby Autism

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 No.214[View All]

Just wanted to post some preliminary progress regarding my AR18 build
i dont have any access to any examples of these because i live in a commie faggot state, but i've started to at least make progress on constructing an upper receiver flat.

im doing this with some knowledge ive deduced and some simplifications as such:
- an AR18 tubular receiver has internal dimensions of 1.25" x 1.25"
- an unbent flat will be approximately 5 inches across
- relative proportions from pictures will be close enough for function

using that i performed progressive rudimentary visual perspective correction for image 1 using GIMP and gridlines to get image 2. i then imported it into autocad and corrected for any rotation. i then visually mapped out the outline to get a general proportions. with this done i scaled the drawing to my 'known' dimension of 5 inches and examined the other dimensions. I then went through them and rounded up or down to units that are convenient to imperial system, and radiused select corners

This would be an iterative process of refining the flat given i dont even have access to an actual rifle. the only dimensions i can think of that will require being really close would be overall length and width. Width i know isn't going to be accurate, given that when bending sheet metal flat dimensions like that wont directly translate to the finished dimensions, but it think its a good starting point. length would be easy enough to change.

176 posts and 58 image replies omitted. Click reply to view.


thread protector came in, looks kinda gay but wtver i can't put a flash hider on it here legally
also decided to get my handguard 3d printed because its fucking cool for me to have designed all the furniture, the website is broken and accepts expired coupons that are supposed to be way more expensive shit, and i wanna see how closely i was able to reverse engineer them. they should arrive next week sometime
also need to make a new rear sight and system for how the rear sight adjusts, last set didn't work


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nice, handguards should be here wednesday
hope they fit


I would've invested in a sneeze guard instead


w-ww-w-w-ww-ww-w-w—ww-w-w-whatdo you mean????!??!?!??? .. ?1


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Got the heat shield flats cut out
After I do the bends I'll cut out the remaining material
Then I'll clean up any ugly eges and sandblast it with the rest of the stuff to give it a dull finish


Bout ready to brougleigh them niggas huh?


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ok nerd lmaoo


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So my handguard design came in
Pretty damn close. The profiles are nearly identical, only some of the smaller details are different. I had to modify them in a similiar fashion as the original, so my model still isn't quite right. This was a cool one to get on, glad I did it


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for salads dear sir…


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So I spent the afternoon bending my heatshields on a fingerbreak. Had to get creative with the bend order and special fixturing to complete the bends. They didn't turn out perfect, but they'll work and look alright.
After bending them I spent a few hours with a Dremel and files to cut out the holes, clean up edges etc.
Now I just need the screws


gud gunr budy how much pak dogs it can maek ded?


now i wish i had a garage and some badass tools to make this kind of shit


if you have the time and REALLY have the tism, you can do a lot of this with a dremel, a set of files, and a vice.


i do not have enough tism for doing it with small hand tools where can i buy more autism?


i can loan you mine, but it doesn't come cheap.


what will 10 /sp/ollars buy me?


CRowjob for 10 minutes or to completion, whichever cums first.


any more work on it? hows she shootin?
also where tf do i get bdu surplus for cheap online?


don't keep us updated


this spigger does not speak for spartmen, spartmanchan.org, or it's administration


>hows she shooting
im slowly working on a rear sight. mostly im in an indecision loop, but i did finally make a choice and will probably try to make it this weekend
also making an mlok rail for mounting optics
>bdu for cheap
a real local surplus store would be best bet. most stores these day only stock new manufac cheap chinese shit and dont even have any surplus, tho
you can sometimes find good deals on ebay from vets dumping all their shit at once


who u mag dumpin that bad boy at


hopin to go make the mlok rail tonight, was going to last week but caught the meme flu instead


oh wow you're makin a moloch rifle wow really fuckin
john podesta SICKO


thx shorky
kinda rear you going? going to co-witness?
sure you have optics already but got a primary arms prism, 10/10 for me wont buy anything else now


ngl not entirely sure where its going to end up, at the very least its not going to cowitness because the original irons are so low. might be in the bottom 1/3? i wont really know till i get it together
i have a trijicon MRO i'll put on it


also ive heard good things about primary arms.. someday i'll buy


hat cowitness man, just feels cluttered to me. put angled flips on, works well for me. u smithin the sights?
jealous of that red dot man, asstigmatism cucked


ya ive got a rear sight design ive made, played with the 3d mockup and its alright. it gets in the way of the guiderod for takedown, but im pretty sure thats how the original must have been as well. a nitpick with the design than anything else


yah I wouldn't do anything else until you fix that guiderod issue


guiderod getting in the way? that isn't normal


go to 0:44 and 0:57 in >>913
see how the guide rod gets pushed into the upper for assembly/disassembly?
well when the rear sight is actually in there it gets pretty tight
on mine the upper is tight enough that the friction actually holds the guide rod in unless i futz with it slightly
well its pretty awkward when you have hte actual sight in there, very space limited
some options are to shift the sight so its foward biasedi nstead of rear biased (i'll post my sight design soon so you see what i mean
im not sure i care enough tho, i just want to finish this so i can work on the drawing so other people can make it too/ make the updated/modernized version that uses modern off the shelf parts


don't finish it until the guiderod issue is fixed


i made some changes to the design… will post pics for you in a sec


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the old style…


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its a bent sheet metal piece for the peep site… a fastener holds it against a threaded piece that is windage adjustable. a stack of half a dozen-a dozen belleville washers in between the sheet metal sight and the windage piece allow for a bit of elevation adjustment, and keep the sight snug in place.


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a 1/16 pin goes through the windage dial fastener right next to the head, as well as through a brass sleeve (bearing surface). that slots into a notch cut into the windage dial and keeps them together. once the windage is set, it would get pinned in place by putting a roll pin through the side of the sight wing, preventing the nut from rotating


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the new one, based off my experience with the 3d printing, is flipped around to face forward. wings have been added to help retain the sight a little better (should be very snug now).
this clears up the space needed for pushing the guide rod in for disassembly


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new rear view


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a quick example of what it may look like if you were to find one of these puppies in an abandoned lot


got the optics rail made tonight
will try to get its mounting pads welded on tomorrow, and have some pics posted


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CAD of my mlok optics rail, it has a C profile for rigidity, and mounts to some mounting pad welded to the top of the receiver
real pic coming next


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Welded on, cleaned a little bit. Some more cleanup left. Mlok rail coming Monday, can get the red dot mounted then
Made the rear sight base. Huge bitch, not complicated but tired and scrapped 2 other attempts. Still have a hole on it to drill and tap, plus some file work. Then make the rear sight


need a vid


ugh, not right now im in public


i've got some plans on making the tool i need to deep draw the rear sight drum.. im very curious if it will work


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rear sight mostly made, some filing left to do to get a better fit, trimming the sight post up a bit, and a drilled/tapped hole. this is definitely a part that could be 3d printed, too much of a bitch to machine this crap


as it this gets closer to completion and i start to shift over to the drawing portion of the project– any suggestions on how to distribute the info? ideal would be relatively easy to access, and neigh impossible to take down.
P2P? a QR code to a magnet, maybe?


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Lol it's ugly
Optic is a bit high. Iron sight obscured. Oh well lol. Maybe I'll buy the quick detach mount for the trijicon


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