machining bore in AR upper receiver - Page 2
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  1. #21
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    Quote Originally Posted by JonP View Post
    Empwoer that sounds like a fun project, yea I think drill, ream and hone if you can, I assume you are making from billet, do you use the side charging handle ? Yea no forward assist no brass deflector and no cover makes it simple and functional for competition. A snug 1 inch bore will give a lot less carrier tilt witch really helps, although there are other ways to minimize bolt carrier tilt. It is really amazing the range of tolerance in different carriers etc.I think if I was making some uppers from scratch I would drill ream and hone to size as I got the carriers. There is no argument though that the barrel extension fit is the most important, although carry rarely is it loose. Good luck. Jon P
    should be! i'm making lowers already right now for a company, that was a very challenging but rewarding experience, looking forward to doing the uppers. yes, they're from billet, no side charging (forward assist) and no ejector port cover, these uppers are pretty simple.

    what kind of hone would i use on something like this?

  2. #22
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    Quote Originally Posted by D Nelson View Post
    Gw Schultz makes all the tooling for the Ar uppers there is a bunch of custom cutters for the uppers. They also need to be broached if you use a standard charging handle




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    i'm not sure why you'd need to broach them. i assume you're talking about the channel the charge handle rides in? that can be machined with a 3/8" .125" thick slot mill with 1/4" shank

  3. #23
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    Oh yeah you going to mill thru the rear take down boss


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  4. #24
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    The uppers get broached believe it or not


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  6. #25
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    Quote Originally Posted by D Nelson View Post
    The uppers get broached believe it or not


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    you're right, i see what you're saying now. fuck. didnt even notice that before.

  7. #26
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    I’m trying to tell you I have made a few of them if you will listen I can tell you a lot about making them and all the ways that try’s to get you screwed up


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  9. #27
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    Quote Originally Posted by D Nelson View Post
    I’m trying to tell you I have made a few of them if you will listen I can tell you a lot about making them and all the ways that try’s to get you screwed up


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    sorry i didnt mean to come off as a know it all, i do appreciate any and all help i can get!

    how would i go about broaching them? save that for the last step? in the middle of the process? can you recommend anyone to do the broaching?

  10. #28
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    If you use forgings they vary in thickness as much as .012 you either need a self centering vise at about 2500.00 or probe every upper before marching or separate all forgings by thickness and change your programs. It throws off the bore to one side. You need to machine the top rail first thing there is special cutters for that also. Then you need to hold the uppers by the rail at all stations if possible for it is the only true feature. The top of the receiver where the barrel hits needs to be cut in the same op as the bore. You need a long special drill to put the gas tube hole in. A broach to cut the charging handle slot.if you are putting the gas door on there is special cutters for the long drill bit the long slot mill for the side cut. There is more but I use 4 machines and takes about 15 minutes to make one upper. Hopefully this helps you out some
    Don


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    Quote Originally Posted by D Nelson View Post
    If you use forgings they vary in thickness as much as .012 you either need a self centering vise at about 2500.00 or probe every upper before marching or separate all forgings by thickness and change your programs. It throws off the bore to one side. You need to machine the top rail first thing there is special cutters for that also. Then you need to hold the uppers by the rail at all stations if possible for it is the only true feature. The top of the receiver where the barrel hits needs to be cut in the same op as the bore. You need a long special drill to put the gas tube hole in. A broach to cut the charging handle slot.if you are putting the gas door on there is special cutters for the long drill bit the long slot mill for the side cut. There is more but I use 4 machines and takes about 15 minutes to make one upper. Hopefully this helps you out some
    Don


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    not a forging, making these out of billet.
    no gas port on these, no door either. do you do the broaching yourself?

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    Do it in the mill with a m19 spindle lock and stroke the z with spindle off


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    Done in the same op as the gas port hole the cut out for the charging handle side cuts


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    my plan was to do it in 2 ops originally. first op cut the picatinny (found the tools for those), bore and everything else i can get to on the setup in a 5 axis, then flip it over, hold the upper by the top rail and finish the bottom side. i'm guessing i'll have to write a custom cycle to broach this.

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    Are you using a forward assist if so there is a step drill for that also you have to lay it over at the right angle. Also the rear take down hole isn’t round it is oval. The worst problem they have beat the price down so low on the uppers the forging is 13 dollars 3 dollars for anodizing and they sell for 30 bucks


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    The best idea is like a new frontier side charger they get big dollars for them over 200 so there is some cushion I don’t think you will find anyone honing a ar 15 upper there isn’t enough money in it. Now ar10 still brings some money
    Don


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    Quote Originally Posted by D Nelson View Post
    Are you using a forward assist if so there is a step drill for that also you have to lay it over at the right angle. Also the rear take down hole isn’t round it is oval. The worst problem they have beat the price down so low on the uppers the forging is 13 dollars 3 dollars for anodizing and they sell for 30 bucks


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    no forward assist.
    thankfully these are for competition rifles so customer is willing to pay reasonable money for them.

  18. #36
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    That helps


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    Quote Originally Posted by D Nelson View Post
    That helps


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    i have been getting 200.00 for a set of Ar10 matched sets bare Si defense




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  22. #38
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    Quote Originally Posted by D Nelson View Post
    i have been getting 200.00 for a set of Ar10 matched sets bare Si defense




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    your work? looks beautiful!upperlower.jpglower.jpg

    these are the lowers i'm making now and a model of the uppers i'm starting on.

  23. #39
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    Quote Originally Posted by empwoer View Post
    your work? looks beautiful!upperlower.jpglower.jpg

    these are the lowers i'm making now and a model of the uppers i'm starting on.
    i dont know how you guys make money on this stuff ?
    Tac sol 9mm upper are $90 or so.
    Those Di sets , looks nice seen them as high as $500 and $325 ish .

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    Quote Originally Posted by D Nelson View Post
    i have been getting 200.00 for a set of Ar10 matched sets bare Si defense




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    Are you DI or sub contractor.
    $200 is pretty darn good price.


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