1/2 scale AR-15

[MachIVshooter]

I appreciate the input there, 1911 guy. Only thing is..........the 1 HP machine is a lathe, not a mill, so the figuring is entirely different. More to the point is that it's not a simple connection with a motor and switch; it's a multi-speed machine with a great deal of its own capacitors and relays.

Could probably reverse engineer the circuitry and calculate loads, but much easier to just try larger capacitors . The 330V 145 MFD units are holding up just fine.

Anyhow, little more progress tonight. Got the dust cover done. I suppose I could have made dies and crushed sheet metal in my 20 ton press, but I felt the better route was to mill this also. Piece of 1/4" 4140 chromoly, milled down to 0.025", with the detent housing machined into it. The detent itself is a piece of 0.067" drill, rounded and with a flat cut, a piece of 0.039" steel acting as the retaining roll pin. It quickly became evident that the detent pin was going to wear down the 6061-T651 pocket pretty quickly, so I drilled it and installed an 0-80 socket head, then did a little dremel work on the head to make it accommodate the pin.







Yes, it's a little large, as is the port. Necessary evil, given the cartridge dimensions.

 

[bannockburn]

Your pure ingenuity and craftsmanship are truly amazing! Keep up the great work!

 

[jell-dog]

A real work of art!
Sir, your progress and craftmanship are truly awesome!!
jell-dog

 

[MachIVshooter]

Your pure ingenuity and craftsmanship are truly amazing!

I appreciate all the compliments, guys, but there really is not a lot of ingenuity here, being that I'm copying an existing design, just in smaller dimensions. There have been some challenges in figuring out how to make certain things work at the smaller scale, but much of the credit still belongs to Eugene Stoner. Things like machining parts that are made from sheet metal stampings on a full size AR are adaptations of necessity with my capabilities, not improvements on the original design.

 

[Walkalong]

The dust cover is really cool. You have a lot of patience.

 

[OpticsPlanet]

Really have enjoyed watching the progress of this project

I'm curious what inspired/motivated you to undertake this?

Any plans to make a carry handle for it? or iron sights?

I wish we had some tiny optic you could mount to it haha

Matt S.

 

[MachIVshooter]

I'm curious what inspired/motivated you to undertake this?

Just wanted a unique project for my first ground-up gun build using real equipment.

I wish we had some tiny optic you could mount to it haha

Plan is to take a cheapie micro RDS and build a housing to make it look like a 1/2 scale EOTech.

 

[bannockburn]

My comments as to your level of genius, in terms of 1/2 scale gun fabrication, as well as your abilities and work ethic, still stand.

I would also add a large measure of modesty to your accolades.

 

[Zerodefect]

Got my new capacitors, found a little time to tinker. Made the front sight, and a faux barrel so that I can keep fitting parts while I wait on my letter. I do have my .17 barrel now, but still need to make or buy a chamber reamer before profiling it.

Anywho, the sight still needs pin holes, sling swivel and drilled/tapped for sight post, but is basically done. 'Bout a 6 hour project there:

Uhhhhhh.

I would have made a pistol tube, and then sent the pics and stock request to the ATF.

That looks like a SBR to me. Not sure the legality of accidently making a SBR, and then registering it, or destroying it iif the ATF gets butthurt.

Can this be patented? Looks like it would sell.

 

[Ar180shooter]

Uhhhhhh.

I would have made a pistol tube, and then sent the pics and stock request to the ATF.

That looks like a SBR to me. Not sure the legality of accidently making a SBR, and then registering it, or destroying it iif the ATF gets butthurt.

Can this be patented? Looks like it would sell.

I think it's hard to argue that it's an SBR, considering the stock is about 4" long.

 

[NickEllis]

It would sell. I would buy one.

 

[Zerodefect]

Weirder things have happened.

I'd buy one. .....eh, put me down for 2.

 

[NickEllis]

I have been trying to figure out how to teach my four-year-old sight picture and trigger squeeze in a compact package. Problem solved…

 

[MachIVshooter]

I would buy one.

I'd buy one. .....eh, put me down for 2.

I don't want to get hopes up, but if I can get this to run right, there is a very real possibility that me and a friend of mine will CAD up the design and start cranking out parts on his Fadal 4020 VMC. Won't be real soon, and we still have to figure out if one of us gets the FFL07 or if we bring in a 3rd party, but small scale production is definitely a possibility. I have no idea what pricing would look like, but I think it'd be safe to say more than $1,000.

A production version would probably be .22 LR, unless someone requested the .17 HM2. Just makes more sense.

 

[MachIVshooter]

I have been trying to figure out how to teach my four-year-old sight picture and trigger squeeze in a compact package. Problem solved…

My 4-1/2 year old daughters holding this looks like a 6'2" man with a Davey Cricket. It is about the right size for my 10 month old son, however.............

 

[Zach S]

Zerodefect, that is a mockup bbl (it looks solid on my phone), therefore its not a SBR.

 

[rogerjames]

Mach, just stumbled on this thread, doh! I skimmed through the pages to see the progress so I need to go back and read all the details, but this is epic. Fantastic work! Would be cool to post a pic next to a full size AR for scale.

 

[MachIVshooter]

Would be cool to post a pic next to a full size AR for scale.

K

Armalite M15A2C

 

[horsemen61]

Thanks for the pic Mach looks good

 

[rogerjames]

K

Armalite M15A2C

That is just fantastic!!!

 

[bullzeye8]

Wow! that picture really put into perspective how tiny it is. That shows how really difficult it must have been making all those tiny parts. Great job! Can't wait to see it finished and shooting.

 

[Bobson]

I saw the picture you posted of it next to your hand at an earlier stage of the build, but seeing it in this mostly-finished configuration next to a normal sized AR15... man. Seeing it in that perspective is just amazing.

 

[ClickClickD'oh]

I think it's hard to argue that it's an SBR, considering the stock is about 4" long.

And that the barrel is a solid piece of metal at this point.

 

[Field Tester]

Definitely not pink. lol.

Not sure if I'll anodize or coat. Anodizing is ideal, but will not cover some of the tiny blemishes as well as gunkote or ceracoat. This thing has received a few nicks here and there as a result of being handled so much in an unfriendly environment for parts fitting.



Can't think of a good reason not to.

http://www.amazon.com/gp/aw/d/B001RTEOVY/ref=mp_s_a_1_1?qid=1417735080&sr=8-1&pi=AC_SX200_QL40

I swear I've seen one smaller than this too.

 

[Trent]

Why do I giggle every time I check this thread?