re: AR15 Buyer's Guide (New Video Series)

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I see in your first video that you have an upper with a 20 in barrel. Is that chambered in 556 or another caliber?

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It's a DPMS 5.56.

It would really depend on the cartridge because something like 300blk does not need a long barrel to max out on velocity. Then again, that's not a long range caliber.

So it just depends what you're looking for. 5.56 is definitely the cheapest though.