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CPOret
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Posted: 3/25/2009 2:40:29 AM
DSA Arms and others I'm sure, offer forged, blank lower receivers. Just how much work/trouble is it to accurately drill the holes & slots, etc. to turn these into spec lowers. Is a cnc mill absolutely necessary? Finally, does one have to be a masochist to even think of doing this? BTW, I'm not.
WhiteDingo
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Posted: 3/25/2009 2:53:00 AM
A CNC machine, no. A mill would sure make your life a whole heck of alot easier, but it can be done, if you're careful, with a drill press and hand tools. There's an article floating around on the internet of the Mujahideen AR15 build, which I think was done even without a drill press. It's just a question of how much time you want to invest into the project.
kcolg30

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Posted: 3/25/2009 8:11:46 AM
If you do not have the time or the required tools it might be better to just buy a stripped lower and parts.
It is better to be judged by 12 than be carried by 6.
whiskeybravo
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Posted: 3/25/2009 8:31:28 AM

Start Here

Tons of good info. You can get the mag well wire edm'd for $35.
The rest is pretty easy if you use "The Fixture".
Follow the threads before you start until you understand the undertaking.

Other info at:
More info

Some more drawings:
Another source for prints and advice

Note:
The DSA part is a raw forging generally conforming to Army P/N F8448641––- Anybody out there have the forging drawing (not the drawing of finished p/n 8448608??


Personally I preferred doing a billet lower... But that requires machine tools that most people don't have...

WB



comp1911
King Dingaling
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Posted: 3/25/2009 8:51:21 AM
[Last Edit: 3/25/2009 8:51:38 AM by comp1911]
Originally Posted By kcolg30:
If you do not have the time or the required tools it might be better to just buy a stripped lower and parts.


I agree. They can be done on a mini mill but its a real pain. So if you bought a mini mill and all the tooling required you're probably looking at about 1K right there.
Builder of fine parts guns since 1997. Trigger guard customizer and jig designer.

كافر
Elwood_Blues
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Posted: 3/25/2009 12:40:12 PM
The Ray-vin (Ray Brandes) tutorial is the last word on machining a forging. I highly suggest you read this ~80 pages before jumping in.
CPOret
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Posted: 3/26/2009 2:01:20 PM
Originally Posted By Elwood_Blues:
The Ray-vin (Ray Brandes) tutorial is the last word on machining a forging. I highly suggest you read this ~80 pages before jumping in.


Sorry, how do I get to/at this tutorial?

Elwood_Blues
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Posted: 3/26/2009 2:10:45 PM
http://arlower.ray-vin.com/ar15/

Google is your friend.
CPOret
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Posted: 3/26/2009 2:28:29 PM
Well yes, but knowledgeable people such as you are better. Thanks.
KELBEAST
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Posted: 3/26/2009 4:52:45 PM
Originally Posted By WhiteDingo:
A CNC machine, no. A mill would sure make your life a whole heck of alot easier, but it can be done, if you're careful, with a drill press and hand tools. There's an article floating around on the internet of the Mujahideen AR15 build, which I think was done even without a drill press. It's just a question of how much time you want to invest into the project.


The Mujahideen was done using an 80% lower. Still impressive, but not a raw forging.
CPOret
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Posted: 3/27/2009 12:50:46 AM
Can this knowledgeable body advise source(s) for 80% forged LRs.
FileForge
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Posted: 3/27/2009 9:54:30 PM
if you're going to do an 80% lower, you might as well just buy a stripped lower from Essential for $105. The only reason to build a raw lower in my opinion is because you enjoy tinkering with machining. I have machined 8 raw lowers, but then again, I am a hobby machinist and have access to a full shop. +1 for Ray Brandes....his guide is THE place to start with regards to 0% lowers.
blainet
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Posted: 3/28/2009 11:54:31 PM
Hello.

I'm out of 60% or 80% lowers as of yesterday. I do expect to finish EDM'ing the mag well and having product for sale right about Tax Day. Yeah, no kidding.

I'm also rolling out a Dedicated 9mm lower but have not finalized the style yet... Colt/RRA or Olympic Arms. Again, available just after the 15th.

These will be 80% "max completion" lowers. Our 60%'s got great reviews. Here's a link to our site:
YellowLogic lower

I will repost with new pictures and more info in 2/3 weeks.
FBJR
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Posted: 5/7/2009 12:00:02 AM
Those lowers look very nice from yellow but seem a little pricey when you can get a ready to build for well under $200. Still, for something off the radar it may not be so bad.