Take a 5.56 x 45mm case, and blow the neck out to 6.8mm. Insert a 115gr. bullet and you've got a relatively high-mass chunk of metal headed downrange to some Goblins. The changes required to convert your existing AR to the 6.8 x 45 Kramer "Urban Combat Cartridge"? A barrel. Maybe an upper but I'm not sure about that. Magazines, bolt faces, and extractors are the same thanks to the 5.56 parent case.
This, my friends, is a Good Thing.
.223Rem/5.56NATO vs. 6.8x45 Kramer
Photo from Defense Review
(I still say, give me an AR (15 size, not 10 size) chambered in .30-06 with a 20" barrel, and a piston operating system, but this is a good second choice! )
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