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Scott Clearman

80% DPMS drawing

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New here, and I'm looking at building a DPMS pattern rifle from an 80% receiver.  I am trying to find a drawing for milling out the FCG and drilling the pins.  I've seen a couple but the dimensions vary even though both are supposed to be for DPMS pattern.  Anyone have a known good drawing?

 

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38 minutes ago, MikedaddyH said:

Just buy a quality jig.

Well,  I really don't want to.  I have a quality machine shop at the house including a pretty nice lathe and milling machine.  If I bought a jig, I'd have to buy a router and that seems like a step backwards.

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51 minutes ago, shooterrex said:

If you have a mill the jig will work fine.

No offense, but I'm not buying a jig. That's like telling someone to put training wheels on a race car.  Jigs work fine no question.  But a mill with digital read outs is more accurate and does better work in most cases.  Using a jig in a mill is actually harder because I would have to be careful not to damage the jig.  My end mills have 2" length of cut, which would cut into the jig itself very easily. 

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I do have that, thanks.  I've done several ar-15's and a Glock mag 9mm ar lower.  This will be the first 308.   I'm sure you know, there is lots of info, and it generally all agrees on dimensions for the smaller ar15 platforms.  When I started looking for 308, wow.  Not only does it vary from lr08 to ar10, but even within the same platform I have found dimensions vary as much as .075".  

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I missed the radius call out on the drawing, I had to look at the file on a web viewer since i'm at work.  

Still have one question/concern:  I understand that a DPMS pattern upper with work with both LR308 and AR10 barrels and bolt groups as long as both barrel and bolt group match.  do either the LR308 or AR10 bolt carriers cause any fitment issues with these dimensions?

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1 hour ago, Scott Clearman said:

I missed the radius call out on the drawing, I had to look at the file on a web viewer since i'm at work.  

Still have one question/concern:  I understand that a DPMS pattern upper with work with both LR308 and AR10 barrels and bolt groups as long as both barrel and bolt group match.  do either the LR308 or AR10 bolt carriers cause any fitment issues with these dimensions?

Carriers are functionally interchangeable, no meaningful difference.

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29 minutes ago, Matt.Cross said:

Carriers are functionally interchangeable, no meaningful difference.

So carriers interchangeable, only bolts different from ar10 ro LR308?  SO any carrier and any matched pair of AR10 bolt and barrel or LR308 bolt and barrel?

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20 minutes ago, Scott Clearman said:

So carriers interchangeable, only bolts different from ar10 ro LR308?  SO any carrier and any matched pair of AR10 bolt and barrel or LR308 bolt and barrel?

Correct.

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8 hours ago, Scott Clearman said:

I missed the radius call out on the drawing, I had to look at the file on a web viewer since i'm at work.  

Still have one question/concern:  I understand that a DPMS pattern upper with work with both LR308 and AR10 barrels and bolt groups as long as both barrel and bolt group match.  do either the LR308 or AR10 bolt carriers cause any fitment issues with these dimensions?

 

6 hours ago, Scott Clearman said:

So carriers interchangeable, only bolts different from ar10 ro LR308?  SO any carrier and any matched pair of AR10 bolt and barrel or LR308 bolt and barrel?

I'm running a fully functional, badass 13.5" gun, which is a complete Armalite AR-10 functional operating group (barrel, gas tube, complete BCG, and full recoil system, from Armalite) in a  DPMS-patterned Aero Precision M5 reciever set, upper and lower (and rail).  Keep the compatible parts compatible as far as operating systems go, but inside the receiver sets, they WILL swap, and work.

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18 hours ago, Swiftab said:

My lowers were from Noreen.  Check the dimension from the front hinge pin center to the Safety detent hole center.  Adjust if needed.  Your trigger assembly position is established by the Safety detent hole that is already in your 80 percent.

How do you indicate to find the detent hole location.  I imagine using a rod in the detent hole to indicate against, but how do you set it up when you set the receiver upright?

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Scott, I'm looking to mill an 80% AR308 lower, but I can't access the file above.  Could you send me what you used?  How did they/it turn out?

Thanks for any help you can provide,   Gary

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3 hours ago, GKocher said:

Scott, I'm looking to mill an 80% AR308 lower, but I can't access the file above.  Could you send me what you used?  How did they/it turn out?

Thanks for any help you can provide,   Gary

Welcome to the forum.  Tell us a little about yourself in the introduction section.

@Scott Clearman has not been here in about 6 months.  Also, it appears that @Swiftab was the originator of the file you are seeking.  He still hangs around here.

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