AR LOWER 1 13/16 buffer tube tap

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corporal34

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Hey guys. I'm working on my first ar build. I have an 80% lower receiver from dlask. I can't find a 1 13/16 tap for the buffer tube locally. Wondering if anybody has one that they might want to sell. Another option is to have a machinist do the threads on a CNC machine. The machinist that is use for some of my projects told me he could do it on a CNC machine. I'm a little worried to let him do it. I know he's good but if he screws it up i'm out 200$. Anyone out there ever do this. I also just bought the lower receiver jig from cncgunsmith. If anyone has a tap and needs a jig maybe we can work something out. Let me know what's out there and any help is greatly appreciated. Thanks:ar15:
 
If you have a friend with the tool and a mill or CNC you're probably better off to get a pro to do the job. If you're at all off the buffer tube will not line up and you'll have troubles.
 
a tap of that size is difficult to start by hand and to get nice and square without getting the first few threads stripped, would be IMO doable with some sort of tap guide on the machine which you don't have. And if you were to do it yourself would you be doing it with a appropriate sized tap wrench, or crescent wrench. just another reason to consider getting it thread milled.
 
machine the lower so it would hold the upper.
pin on the upper to the lower and tap it with an unpowered drill press.

the upper will keep the lower perpendicular to the tap.

where are you located.
 
I'm in ontario. The machinist in question is a "pro" I guess. not a small backyard mechanic type. Works in a fairly big machine shop. The tool he described to me yesterday is definately not for hobbies. He's not doing it himself. He is getting some other machinist who runs the CNC full time to do it. I was curious if anybody else had done this before. I will give it a little bit more time here and see what suggestions you guys come up with before I give it to him.
 
corporal34 said:
I'm in ontario. The machinist in question is a "pro" I guess. not a small backyard mechanic type. Works in a fairly big machine shop. The tool he described to me yesterday is definately not for hobbies. He's not doing it himself. He is getting some other machinist who runs the CNC full time to do it. I was curious if anybody else had done this before. I will give it a little bit more time here and see what suggestions you guys come up with before I give it to him.
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Threading a hole is not complicated. I wouldn't worry about having your buddy do it.

If I wasn't at school I'd look at helping you out.
 
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