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Topic: A take on the 0% lower: sheet metal!, My entry into the ar build-off.< Next Oldest | Next Newest >
AGreyMan Offline





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Posted: July 24 2005,13:32 QUOTE

Hi Folks:

Here is my entry into the AR Build-off, “Ugliest Rifle” category. It would have been a lot prettier, but I don't have Fluffy to give me aesthetic advice!

It is a receiver made from .100 4130 sheet formed to shape using homemade dies. It was based loosely on the Bill Holmes version of the AR lower, but I departed from his path pretty quickly.

I used the .100 metal for a few reasons. First, it’s pretty tough and herky. Second, it made sense dimensionally. If I called a magazine .900 wide, I bent the mag well to that, and then bent the “U” that makes up the FCG holder portion to .900 OD, it made the ID .700. Worked pretty well, I think.  

The bear of the whole thing was the buffer tube tower. I was trying to make this along the lines of my OhmsResearch AK, in that you didn’t need a lot of fancy tools to make it. Well, I ended up cheating and using a mill on this proof-of-concept lower, but I am chock full of ideas on how to make it easier on the next one! Anyway: Buffer tower. I found some tubing with an ID (1.180) that just barely allowed the threads of the buffer tube to slip inside. I ended up using a combination of JB weld (Thanks to a guy who posted a thread somewhere called “Mujahadeen AR-15) and setscrews to secure the buffer tube to the tower. It is not removable, though of course the buffer and spring are. Without a large (1.5” ?) end mill, I had to pretty much trial and error the curvature of the tower. For me, it was harder than it looked! I managed to get a template made, so I could so it without too much fuss.

Of course, I did not drill it for the detents for the front or rear take-down pin, nor the selector. Instead, I drilled and tapped the ends of these and secured the takedown pins with 8-32 screws and the selector with a 10-32 and a washer. I drilled the underside of the selector, and put a small spring and detent ball in there to make the positive “click.” I also used low temp (575 degrees F) silver solder to attach stops.

I used the high-temp 38,000 psi silver braze to affix the “ears” for the bolt hold-open to the side of the receiver.

So far, after ~200 rounds, it functions perfectly.

Well, I’ll be anxiously awaiting the judges’ decision. If anybody has any questions about this thing, let me know. Sorry about the photos. I had just finished Parking it, and it still had a lot of oil on it.

Oh, and if anyone has an extra stock screw, I’d like to purchase one: I am using one from another AR. Drop me a line.

Stay Safe,
AGreyMan


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"Its cleverness lies in its contempt for cleverness. It's a tractor of a rifle, a serious piece of work."

-Stephen Hunter on the AK-47
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AGreyMan Offline





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Posted: July 24 2005,13:34 QUOTE

Closer look...

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"Its cleverness lies in its contempt for cleverness. It's a tractor of a rifle, a serious piece of work."

-Stephen Hunter on the AK-47
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AGreyMan Offline





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Posted: July 24 2005,13:35 QUOTE

Other side...

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"Its cleverness lies in its contempt for cleverness. It's a tractor of a rifle, a serious piece of work."

-Stephen Hunter on the AK-47
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ZENRINGO Offline
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Posted: July 24 2005,13:48 QUOTE

That is very interesting. Great piece of fabrication :thumbs: I love the A1 look.

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“I believe there are people out there that just have a warrior spirit, whether it’s fighting or something, they’ve got to do it. It’s hard to identify with me; it’s just something I do.”

---Evan Tanner, 2005
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Calizack Offline





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Posted: July 24 2005,13:57 QUOTE

:thumbs: good build...ugly but good.
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neilfj Offline
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Posted: July 24 2005,14:13 QUOTE

Ugly is good!

When I get some time (and ambition) I'm going to make one out of plywood. No reason why that wouldn't work either.
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zanorak Offline





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Posted: July 24 2005,14:18 QUOTE

That's sweet! I'd love to see more info on that one.
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AGreyMan Offline





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Posted: July 24 2005,15:18 QUOTE

56K Warning!

Several construction photos:







--------------
"Its cleverness lies in its contempt for cleverness. It's a tractor of a rifle, a serious piece of work."

-Stephen Hunter on the AK-47
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AGreyMan Offline





Group: Members
Posts: 266
Joined: May 2002
Posted: July 24 2005,15:19 QUOTE







--------------
"Its cleverness lies in its contempt for cleverness. It's a tractor of a rifle, a serious piece of work."

-Stephen Hunter on the AK-47
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AGreyMan Offline





Group: Members
Posts: 266
Joined: May 2002
Posted: July 24 2005,15:20 QUOTE







--------------
"Its cleverness lies in its contempt for cleverness. It's a tractor of a rifle, a serious piece of work."

-Stephen Hunter on the AK-47
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84 replies since July 24 2005,13:32 < Next Oldest | Next Newest >

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