I'm a bit undecided at the moment so I thought I would get some opinions on here. Full disclosure I am an AR-15 addict and have several, including 1 stripped lower right now. That lower may very well be my last every AR-15 build, originally I had planned on 50 Beowulf but the more I think about it I'm just not that excited about that caliber any more. So I'm looking for some caliber suggestions for my next build. I already have AR's in 5.56, .300BLK, 7.62X39, 6.8SPC, 10MM Auto and .450BM so those calibers are already off the table. This is a standard AR lower and I don't want to mess with mag adapters so 9mm is also not on the table. Lastly I'm not really concerned about build cost but cost to shoot is a small factor, I don't mind if match bullets are expensive but I'm hoping for a caliber that also has reasonably priced plinking ammo available.
I would very much like to hear what other calibers you guys like in an AR-15 and why.
I would very much like to hear what other calibers you guys like in an AR-15 and why.