The Swiss Arms SG 553 RP 4K Rifle features the ability to take AK-47 magazines and 7.62x39mm cartridges currently deployed with certain tac units overseas. The adjustable gas system allows the user to run at a level that works best for them. This one displayed by Larry Vicker of Vickers Tactical is a pistol modified with an SBR. According to Larry, it took Swiss Arms quite a while in getting the kinks out so that it can take a wide variety of AK magazine. Sounds simple but time consuming process. Here's the following AK mag types that it will take:...