The Firearm Blog
reviewed CMMG's MK47 Mutant. It's AR that takes AK-47 magazines. The article goes in to details. It uses DI system, and comes in 3 variations. Price ranges from $1499.95(Mutant T) to $1864.95(Mutant AKM2)
CMMG Link:
http://www.cmmginc.com/category_s/1998.htm
https://www.youtube.com/watch?v=1XviRUKaULE
Some other review videos
Hickok45:
http://youtu.be/xe48LfRMkt0
MrGunSlinger Channel:
https://www.youtube.com/watch?v=HKVFYNJWCak
From: The Firearm Blog, CMMG