I am wanting an integrally suppressed 300 bo and I want to be able to swap barrels periodically as needs arrive. Un-suppressed 300 bo or 5.56, I really don't want a whole lot of duplicate complete uppers just barrel swaps or replacing. I've read quite a lot of articles and watched more youtube then necessary, however only one used go-no go-field gauges. Any input about this situation would be greatly appreciated.
Thanks,
Bill