What Caliber to Build an AR15?

[melensdad]

I've got some new lowers coming in and need to build up some new guns with these. I'm looking at 4 to 5 more builds, so multiple calibers are possible. The ONLY configurations I will consider are the politically INCORRECT versions. So they will have flash hiders, probably but not necessary bayonet lugs too.


Anyone think the AR57 upper is a good idea? The AR57 uses the little 5.7 round, the 50 round FN magazines, and ejects down through the mag-well.

How about the 358 Gremlin wildcat? That is a deer legal hunting round here in Indiana, but I'd prefer to stick with factory ammo. Still the Gremlin has a lot of promise and would be a great deer legal gun. One thing that keeps me away from an AR based Wildcat is the fact that Remington is slowly rolling out new ammo announcements with rounds specifically designed as AR15 based HUNTING rounds. I figure that eventually they will legitimize a 358 caliber bullet for us Hoosiers???

I'm thinking another 6.5 Grendel would be good and probably a 6.8 Rem SPC would be good too. I don't have either of those in "M4" type configurations.


So what are your thoughts? If you had some extra AR lowers available for some new builds, what caliber and politically incorrect configuration would you build?