AR related. Looking for an upper

6.8, 6.5 grendel, 204 ruger, 22lr, 458 bushmaster, 50 Beowulf and probably like 20 or so other ones.

What are you looking to do?

Hunting what? 6.8, 6.5, 300 blackout for a small frame ar. You could always step up to the large frame ar and get a 308, 243, 6.5 creedmoor, etc etc

None of these require any mods to the lower?

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None of these require any mods to the lower?

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No but they would most likely require different magazines, although I don't know that for sure.

Note that pretty much all the rounds listed are expensive. And unless you plan on reloading them yourself, you'll most likely need to order the specific load online that you're looking for.

My suggestion would be to step up to AR10 territory (or large frame as kengel mentioned). You get much more versatility specific to hunting. 308 hits large animals a good bit harder than 223/556.

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Thinking of using an AR for hunting

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You can shoot a lot of different rounds out of the same lower, however, other issues come into play. What type of hunting? depending on this, like stated above, you might want to switch to ar10, if you are stuck with the ar platform

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And if you don't plan on reloading, be ready to do the wallet mod

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this....