The KAC SR-47 is an SR-15-based assault rifle based on the AR-15 family of rifles. It was created by Knight's Armament Company for USSOCOM, but was never actually fielded. It is chambered in 7.62×39mm.
The SR-47 is basically an SR-15 that will accept standard 7.62 AK magazines. All parts that are modified from the AR-15 on a standard SR-15 are modified on this rifle as well, with further modifications to accept the standard AK magazine. This rifle sports a custom barrel manufactured by Obermeyer Barrel Co., and is threaded to accept a KAC suppressor.