re: Let's build the OB AR15

If cost isn’t a factor:

JP for Barrel, silent captured spring, bcg, and gas block

I like a fixed stock so the ace or even the magpul moe works.

Hiperfire for the trigger

I prefer a small diameter hand guard with no rails - aero makes a good one that fits their upper/lower.

I have many ar’s and I prefer an 18” Barrel for the rifle length gas system. Much softer shooting.