I’ve never seen much point of a dedicated 5.56 can unless you’re just ok with dedicating it to that caliber. I love my SiCo Omega 36m. It’s a QD modular can that you can run in a short or long configuration, works well on all of my rifles and I can slap it on my 9mm pistols as well.
This right here.
I've had mine on my 45/70, 300wm, 45acp 1911, 9mm AR, 9mm glock, .308 ar10, 6.8 ar
The only thing needed to run on those other than the can itself, is the corrent bravo mount from SiCo