DOCTORDEMO

I should get one of those, what is Belt Fed's card number again? On a lighter note, I'm off to a gun show out at McClellan park, might be nice to have that card info handy while I'm there .

You had better hurry, she got a little banged up putting her in the trunk and it is awfully hot out so I'm not sure how long it will be fresh.

I am new here, not new to this world. BR549 is part of Junior Samples used car sales phone number. Not enough digits for the card number and too many in the security code. Come on man, I won't take more than my fair share.

I am still fairly new around here so it would be very helpful if you guys would take a moment and update and post all of the pertinent credit card information and security codes so I can start making a few necessary purchases.

Well, I compared the AR-15 drawings with the AR-10B drawings and did some reverse-dimensioning. Now my reference point is from the take down pin instead of the pivot pin. I also compared the uppers and found that the DPMS 308 and the AR-15 when in battery is nearly identical in the dimension from take down pin to firing pin, so between your comments, the web, and my two uppers I have started making chips. I know that I could have probably completed the build by now if I would have ordered either a lower or a 80% or a jig but I was looking for a little challenge, although I would have thought drawings for the DPMS would have been as easy to come by as the other platforms out there. I might be a little stubborn also. Being totally new here, should I continue this thread here, or start a new one as this build moves forward?

I am glad that Snow N Surf posted this, I would like to comment on this as well. It appears that different industries or professions view information about particular topics as guarded or secret . Not just with springs, but a lot of stuff across a vast range of items. It boggles my mind that a spring for a particular application is purchased (or used) based on it's over all length. Maybe that is supposed to make things easier, but it confuses things fairly quickly in my opinion. I feel that it would be so much more beneficial to the firearm community as a whole, when talking about coil springs, a standard be used to describe springs more accurately. This thread is a perfect example that it touches on the issue, but doesn't take the mystery out of the equations. Wire diameter, number of active coils, coil diameter, installed length, spring rate, and cycle life are all valid parameters that could be stated when describing a spring for a specific use, in this case a buffer spring. I am not trying to be critical, it just seems that finding reliable information is necessary to grow the build community in a positive way. Steve

Well, so far, You are the only source that has anything that says 0 deg. for the DPMS specifically. Thank You. The site that you linked actually has the same drawings that I have, but I couldn't find any DPMS information. I didn't want to start hacking and hewing away at a lower and find out hours into the process that it was going to be for "the next" build. So the lower is going to be slightly easier than the 3 deg. mag well debacle, but still a challenging project with a manual mill and no dro. If all else fails I can buy a lower, but what's the fun in that? Steve

Thanks Swiftab, now that I think about it a little, after the convoluted introduction what I should have asked was : if anyone with DPMS lowers could verify the angle between the mag well and the top of the lower as 90 degrees or something else. Steve

Thanks for the welcome! Steve

Hello everyone, I'm not sure which rabbit hole I went through to find this place but I've been looking around a little and decided to join in. I'm a retired millwright/machinist, gun enthusiast, new to the AR /LR platform. I have recently completed a 300 blackout build from one of the 80 percent kit suppliers but what I really wanted was a .308 . When I was shopping around there weren't any in stock anywhere so I settled. Moving forward I have a newly acquired .308 LR upper DPMS (style) from one of the big online stores. Here is where the fun and questions begin, instead of another 80% do it yourself lower, I have a piece of 7075 sitting in the mill vise and I want to do the whole shebang myself. Can anybody tell me if the AR-10 and the DPMS share the 3 degree mag well angle to baseline, or is the LR .308 DPMS mag well cut like the AR-15 ? I have a drawing that is for an AR-10 .308 that conforms to ASME Y14. 5M -1994 and looks to be very complete and well detailed, and I know it wont work for the LR .308 DPMS due to the difference at the buffer tube area but I can't find any drawings for the lower I am wanting to build. Thanks in advance Steve