half the stuff in that midway kit is pot-metal that's well known for breaking as soon as torque is applied. which is unfortunate, because it's a great idea.....just craptastic in application.
Brownell's has a complete kit of tools for ARs. Not cheap, but VERY high quality pieces.
I have just been buying the tools I need, as I need them. For a lower, the roll pin punches and roll pin starters are good.
Brownell's has a special punch for the bolt hold open roll pin. It had a flat ground down it, so it clears the receiver better.
I have that punch. It's for removal from the muzzle end rearward. No different/handier for installation. Most lowers you can't install from muzzle end due to the profiling on the magwell. Honestly I just use electrical tape on the receiver and a bench vise with taped jaws to install that one.
Anderson Rifles sells an Oops Kit. Nice to have around, the commonly lost or damaged parts in building a lower.
Roll pin punch set
Roll pin starter punch set
upper vise block
DPMS multi tool
I'm assuming you have a bench vise and smallish hammer. If not, add those to the list and you're pretty well there for 99% of the stuff you'll do with an ar-15.
I also happen to be just across key bridge from you more or less, and happen to have all those things and even a few more.
Hint there.