I have "The Itch" again ... this time looking at a 45ACP AR. Probably a 7.5" barrel.
Build or buy?
Receiver manufacturers you have used - pros / cons? If you have used a 9mm set instead, that info is useful also.
What works best?
Things to avoid?
Must haves?
Lower compatible with Glock 45ACP magazines.
Shims required for suppressor use?

I don't know what I don't know, so tell me what I am missing.

I did a search (weak kung-fu) so if there is a thread I missed, pop a link please. Main thread I found had posts by UW building a 9mm with New Frontier receiver(s).