Possibly ksc/kwa according to a message I just got. Everything seems to work as it should. CHECK OUR OTHER LISTINGS FOR TONS OF OTHER GREAT DEALS!!! This is a listing from East Coast Airsoft. We are a physical retail store located in Bel Air, Maryland. If you have any questions or concerns feel free to reach out to us any time. Either on here, Facebook, Instagram or you can give us a call at 410-838-6856. The store is open every day from 11AM to 8PM. ALL PRICES DO NOT INCLUDE SHIPPING unless stated otherwise, please message us your full shipping address for a quote. YES, WE DO TAKE TRADE INS, IF YOU LOOK AT OUR WTB POST EVERYTHING IS OUTLINED THERE. WE CANNOT RESERVE ANYTHING THAT IS NOT PAID FOR. WE CANNOT GUARANTEE WHAT ITEMS WILL BE IN STOCK BY THE TIME WE RECEIVE YOUR TRADE IN FOR INSPECTION.