My AR Lower receiver from scratch

chsnprodigy · Jun 25, 2013

Got the parts back from the anodizer, they didnt charge me anything since they burnt one part. Parts look great, and I will be taking the part I need to re-make back to them when I get it made. I will be assembling tonight if I can with the bad part....then off to the etcher.

Sticky · Jun 25, 2013

Ouch... but the rest of the parts look great! Nice work! :lol:

KenBer · Jun 25, 2013

chsnprodigy said:
Plans are on my original post. I also put the colt blueprints with it. I had to go back to the colt blueprint to pull 2 or 3 dimensions and calculations.

Oops -- sorry. Thanks.

chsnprodigy · Jun 26, 2013

Got some time to tinker last night and assembled all parts before getting it etched. Off to the etchers today. Please excuse the table cloth...its kinda busy.

yellowsled · Jun 26, 2013

Where can I buy that?

Sticky · Jun 26, 2013

Looks great! and.. you will have plenty of real estate to work with for etching, one perk of that design! :lol:

chsnprodigy · Jun 26, 2013

Sticky said:
Looks great! and.. you will have plenty of real estate to work with for etching, one perk of that design!

Haha no kidding.

T-Mac · Jul 2, 2013

That is nasty :bowdown:

I would take that over normal lowers any day!

chsnprodigy · Jul 3, 2013

T-Mac said:
That is nasty

I would take that over normal lowers any day!

Thanks for the compliment T-Mac.

chsnprodigy · Jul 3, 2013

Ok here are pics of it after etching and fully assembled. I KNOW ITS ON FIRE! But right now there is no way for the safety/fire selector to stay on either since this design doesn’t use detents. I will be cutting the magnets to fix this today. Quick thank you to smdub for turning out some pivot point pins. :party29:

So here it is fully assembled and I compared it to my DPMS AR and it looks like it should fire...

. The one weak point I can see with this design is the aluminum pin that holds the buffer spring and buffer in, I think with firing over and over the ali pin might give up. If it does happen I will address it and put a steel pin in. I chose the Metallica "Dont tread on me" rattle snake as my emblem. It was my wife’s idea, and it kinda stood for what this entire build was about. Im not a gun nut, gun freak, rambo I am not....but once someone tells me I cant (Government) I say I will! It made me feel patriotic to build this from the ground up and hope others do as well. Hope everyone has a good 4th of July, and please remember the men and women who have fought and who are fighting to give us our freedoms. Ok....Ill get off my soap box now. Enjoy the pics. Oh I will be attempting to fire it in the next couple of days.

Sticky · Jul 3, 2013

Looks awesome Brotha!! and yes, it IS on FIRE!!

Question on the safety selector issue... is there not enough meat to use the conventional spring/detent arrangement on the lower? I have to get the drawings into CAD so I can play around with that concept.. seems to me that all we need is a little more meat there and it could be step drilled to accept a spring and detent.. I'll look into that before I start any cutting....

smdub · Jul 3, 2013

Sticky said:
seems to me that all we need is a little more meat there

Thats the tricky bit. The hammer well is as wide as the trigger well in this design. The detent location is then 99% in 'free space' (the 1/8" drill would touch the existing side plates here by just a couple thou.) You'd have to bolt on a block or bring the grip part up farther. The latter is probably easiest, but the drill is going to be RIGHT on the edge and you'd probably have to drill them bolted together. Could be done.

Sticky · Jul 3, 2013

Working on getting the parts Cad'd today. I will look into that. Perhaps making the plate from thicker material, requires more milling, but it would eliminate the pin issue and I'd have to modify the mating parts as well, but it would beat trying to add onto what is there. I will have some ideas before the weekend is up..

chsnprodigy · Jul 3, 2013

Sticky said:
Looks awesome Brotha!! and yes, it IS on FIRE!!

Question on the safety selector issue... is there not enough meat to use the conventional spring/detent arrangement on the lower? I have to get the drawings into CAD so I can play around with that concept.. seems to me that all we need is a little more meat there and it could be step drilled to accept a spring and detent.. I'll look into that before I start any cutting....

Im gonna have to say no. Maybe if you made the back plates thicker, it would leave more meat on it....but as of right now with this design not enought meat.

chsnprodigy · Jul 3, 2013

Sticky said:
Working on getting the parts Cad'd today. I will look into that. Perhaps making the plate from thicker material, requires more milling, but it would eliminate the pin issue and I'd have to modify the mating parts as well, but it would beat trying to add onto what is there. I will have some ideas before the weekend is up..

Honestly the design modifications to this lower could be endless. Would you mind posting the Cad drawings just so I could see?

Sticky · Jul 3, 2013

chsnprodigy said:
Honestly the design modifications to this lower could be endless. Would you mind posting the Cad drawings just so I could see?

I know.... :lol2:

Yes, I will post them here on your thread, once I get them sorta configured... :thumbsup:

chsnprodigy · Jul 3, 2013

Im sitting here with magnets, but they just dont look right. There about 3/4 inch long .100x.100 squares. Anyone have any ideas where I could pick up some small magnets? I got these at home depot......

Fox123 · Jul 3, 2013

Is it just me?

The safety selector looks backwards. Safe is where pew pew pew should be.

chsnprodigy · Jul 3, 2013

Fox123 said:
Is it just me?

The safety selector looks backwards. Safe is where pew pew pew should be.

Negative ghost rider, with this design the safe is back and up is fire. The reason for this is because the three screws by the selector interfere with normal operation. The motion from safe to fire will be the same as normal, but the selector is backwards.

Sticky · Jul 3, 2013

chsnprodigy said:
Im sitting here with magnets, but they just dont look right. There about 3/4 inch long .100x.100 squares. Anyone have any ideas where I could pick up some small magnets? I got these at home depot......

You need to find some alnico magnets.. small, can be had in round and powerful!

My AR Lower receiver from scratch

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