Last one did well, so let’s try again.
You know the drill: ask questions, maybe get serious answers.
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I'm straight up building a 12.5 .308 pistol because it will be awesome. Going to use aero precision m5 parts due to their sexy good looks and good reputation.
Alternatively, i am down with buying a finished upper if i can ever find one. But i don't imagine that will be likely.
I built my first AR lower without a bench vise and...well...that's why I have a bench vise today.
Most of the lower triggers work between AR15 & AR10 platforms. The holes are in the same spots relative.
If you're gonna build it all from scratch make sure you get the right AR-10 pattern parts for everything. I believe DPMS style is the most popular but mismatch doesn't work. I'd say a bench vise is pretty critical for building uppers in my experience, AR-15 only though. Good luck with the shorty fireball maker. I shot a friend's chopped PTR in .308 and it's stupid fun. Makes the fabric/tarp roof on the shoot house bow out when you shoot in it. Impractical, yes. Fun, also yes.
Bench vise is like $30 at harbor freight. Be sure to use a coupon. If you save your receipt you can return it after you're done.
I keep looking for a problem in your suggestion but can find none.
Bench vise is always the first tool for any shop. Mount it to a board and then you can clamp it to your table, ect.
Headspace should technically be set when the barrel extension is installed on the barrel, combined with an in-spec bolt. With all new parts you will be fine 99.9% of the time.
With there said, a good set of gauges is cheaper than a new face. Not a bad thing to have in general.