I would say build one.
Use a CMMG kit, barrel the length you want then the lower.
That way you are only a barrel and BCG away from 556, 300bo or others.
It is all metal, uses all standard parts short of the barrel and BCG.
I have two, one pistol Smith with lower round count, when I was waiting on my SBR and another MP 15-22 Magpul Moe tan. It was a special run.
Plan to sell both soon, just want to put a few more rounds in them to justify it.
I want aluminum upper and lower is the only reason I would sell them.
Or just get a Ruger. 10-22 spend the rest on mags and ammo.