I got the wants for a custom AR!have
I want to build a lower that will handle various uppers.  My thought for the uppers are a M4 type-short barrel .223, rails, light, t-grip & red dot and a scoped, long range, heavy barrel .223 & .308 and possibly a .22lr for CHEAP plinking.

To start with can I have one lower that will work with different caliber uppers, .223, .308, 7.62x39 &  .22lr?  I'm not gonna ask whose parts are the best because there are a LOT of good choices but whose parts should I stay away from?

I'll leave it at that to start.  SO bring it on.7mm-08

A regular AR-15 lower will do every caliber listed except the .308.

yep,

lurk around here for awhile or search the question, it has been discussed before and frequently.



and welcome to the site