My AR Lower receiver from scratch

cougar70 · Jun 4, 2013

And I forgot to mention...

Cool Piece!!!!

chsnprodigy · Jun 4, 2013

FrankOceanXray said:
What I mean by the question is, what gets serialized? Thus, what is the firearm.

I cannot think of the name of the gun, the US military , older, belt fed.. 1919? But the side plate is the part regulated , that plate is the firearm, and gets the serial.

So what part if this would get the serial number and be the firearm?

I might toss a serial number on it just cause.....Im not planning on selling it or anything like that....I dont think ill ever sell a firearm I own. As far as what part ill serialize...probably a side plate.

davidolde · Jun 4, 2013

Very cool, and nice work so far- I'd love to see the final product when you get it finished. I'd also love to see a video of it being fired...

chsnprodigy · Jun 4, 2013

davidolde said:
Very cool, and nice work so far- I'd love to see the final product when you get it finished. I'd also love to see a video of it being fired...

That might be a possibility...might be down the road some time...but a possibility.

Watkins87 · Jun 4, 2013

NICE WORK!!!!!

yellowsled · Jun 4, 2013

One of the coolest thing I have seen in a while... Really looking forward to update to this project.

annihilation-time · Jun 4, 2013

I dig it. She looks like a tank.

tc617 · Jun 4, 2013

Your lower looks awesome! I can't wait to see it finished.

I wonder why someone hasn't started manufacturing an AR lower kit that fastens together like this one. If they left a couple holes for the trigger assembly unfinished so that it would not accept a trigger assembly, would the BATFE would consider this an 80% lower?

556ready · Jun 4, 2013

OP way cool! Thanks for sharing!

chsnprodigy · Jun 4, 2013

Someone does manufacture a bolt together lower:

http://www.ktordnance.com/kto/products.php

Its very good and looks great.....but I wanted to make my own. And this one requires for the milling of the FTG and some drilling of holes.

Sticky · Jun 4, 2013

tc617 said:
Your lower looks awesome! I can't wait to see it finished.

I wonder why someone hasn't started manufacturing an AR lower kit that fastens together like this one. If they left a couple holes for the trigger assembly unfinished so that it would not accept a trigger assembly, would the BATFE would consider this an 80% lower?

No telling with the ATF.. LMAO

Basically they shun any machining whatever in the FCG area, so I don't know how that would work with a plate-made lower...

huesmann · Jun 5, 2013

smdub said:
I like it too. But since ARs are aluminum maybe a street sign would be a better 'donor' than a steel shovel

Street signs are also steel.

capman98 · Jun 5, 2013

Very cool. as for the serial #. not required if your not selling. BUT, I would recommend some sort of distinguishing mark with photos for documentation in case it is ever stolen.

smdub · Jun 5, 2013

huesmann said:
Street signs are also steel.

Everyone we ever 'borrowed' (when I was younger) was aluminum. Maybe you didn't go big enough?

Note: Not stop signs or any of the important ones. We were young but not completely stupid.

eruby · Jun 5, 2013

Very cool indeed!

chsnprodigy · Jun 5, 2013

capman98 said:
Very cool. as for the serial #. not required if your not selling. BUT, I would recommend some sort of distinguishing mark with photos for documentation in case it is ever stolen.

Thanks for the info.

chsnprodigy · Jun 10, 2013

Ok, so I got some time to mess around with the lower receiver and and attach it to my current upper. I had to "wallow" out the holes to make everything line up perfect....and you can see in the pictures I got everything to line up. Yes the lower and upper are held together by 1/4-28 bolts. Next im going to move onto the magazine release.

smdub · Jun 10, 2013

Instead of plain bolts, think about using shoulder bolts. They are smooth (and precision ground) in the middle section and when tightened will 'bottom out' and prevent pulling the sides together. Though, one of the side holes for each would need to be smaller (and possibly tapped.) A 1/4" shoulder bolt usually has 10-24 threads. So maybe just a thought for 'next time'

chsnprodigy · Jun 10, 2013

smdub said:
Instead of plain bolts, think about using shoulder bolts. They are smooth (and precision ground) in the middle section and when tightened will 'bottom out' and prevent pulling the sides together. Though, one of the side holes for each would need to be smaller (and possibly tapped.) A 1/4" shoulder bolt usually has 10-24 threads. So maybe just a thought for 'next time'

Thats a great idea if I ever make a MK2 design.

smdub · Jun 10, 2013

Well, if you got a shoulder bolt that was the full width (went through both sides), you could put a thin jamb nut on it. Would look & work better than the plain ones that are in there now at least. W/ regular bolts, I'd be worried that the threads tear up the upper's tabs when moving around under recoil.

Maybe better: cut a 1/4" pin to length and drill/tap both sides for a button head cap screws? A #8 screw will have a bigger head than 1/4".

Just thinking outloud... Im a hobby machinist and really enjoy stuff like this.

My AR Lower receiver from scratch

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