Quoted: If the buffer tube threading is a real concern, ShadeTree has the stage 2 80% lower drilled and tapped.
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I initially thought that the tapping would be particularly difficult, but after doing it I am confident that anyone with basic familiarity with hand tools could do it as well.
When tapping holes you should back out the tap every quarter turn. Keep the tap well lubricated while doing so.
If you accidentally tap your buffer tube hole crooked you can always back the tap out and re-tap it.
All you have to do is apply preasure in the direction of the error.
My first 80% was about an eighth inch out in 2 directions and I backed it out and placed the tap inside the same threads and ran it through applying preasure once in each direction and not only did it straighten out, the buffer tube still threaded in just as tight.