"Dialing in" is realistically only required for gamer guns and suppressors, at least for 5.56. A quality barrel, BCG, and trigger group in decent receivers should just work with a rifle, A5, or carbine (H1 or H2) recoil system. All my ARs run fine when reasonably clean and lubed with ammo from Tula to full power 5.56 spec ammo. My 18" rifle is the only one that's vaguely finicky and it just needs to be well lubed.
I would rather swap between a standard and a BRT reduced port gas tube for suppressed use than mess with an AGB.
Other calibers? Meh. 5.56 and 22 lr are the only AR rounds worth shooting
Andy
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