For those who are using the KSC MP7 Gas Blowback SMG or the Tokyo Marui MP7 MAEG can welcome this accessory made by Tac Workshop. This MP7 Sling Swivel End is to be mounted near the top area at the end of the airsoft gun. This has HK markings and serial numbers for those finicky with details. This costs US$26.50 at Toy Soldier. This comes with pins that will allow you to mount on the GBB or MAEG versions.