The Gear Locker talks about the accessory that he says all KSK reenactors need, the Clutch Precision G36Ka4 Top Rail... "Today, we are upgrading one very important piece of the Airsoft Ka4 replica to be as realistic as possible. This, is the top rail from Clutch Precision.

This aluminum, one-piece rail is incredibly sturdy, to real spec, and meant for the VFC gas blowback system… or is it? I can’t settle for inaccuracies, so I talked to Clutch Precision and they agreed to send me one of their top rails to make work for AEGs. As you will see in this video, it actually isn’t too hard. A huge thank you to them for making this happen!"