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I use a clevis pin as well. Works perfectly. https://www.homedepot.com/p/1-4-in-x-2-in-Zinc-Plated-Universal-Clevis-Pin-815418/204276164You can build an AR kit like that with no special tools. The hardest parts are putting in the pivot pin detent and the roll pin for the bolt catch.
The closest thing to a "necessary" tool is probably the wrench for the stock castle nut, but you could do it without one. After that, the flat sided roll-pin punches from Wheeler are handy for the bolt catch roll pin and decrease the chance of scratching your lower, but you can do it without them.
For the pivot pin detent, there are tools from Caldwell and others, but the cheapest is a 1/4" clevis pin from the local hardware store - you insert the detent through one of the holes in the pin, then turn it to hold the detent in, then carefully use the pivot pin to push the clevis pin out and capture the detent. https://www.ar15.com/forums/ar-15/H...n_using_a__1_clevis_pin___56K_death/4-362116/
A roll pin punch for the trigger guard roll pin is helpful, too.
You can buy sets of tools from Wheeler and others just about anywhere that sells AR accessories, but most of them are unnecessary, especially where you are assembling a kit with an assembled upper.
I use needle nose pliers with electrical tape to put in the bolt catch roll pin, oiled up and squeezing in slowly of course. I solve the trigger guard pin issue by using screw in trigger guards like this one from Aero Precision: https://aeroprecisionusa.com/billet-trigger-guard-anodized.html
Use blue loctite of course.
Everything else is complete cake to do. You truly do not need a lot of specialized tools beyond the AR armorers tool (for the castle nut and the barrel nut).