Cobalt Kinetics A5-CK H4 Buffer Black. The raised "anti-tilt" feature on the A5 buffer came into reality from a specific request that we made. Our engineering team noticed that even though carrier tilt is mainly an issue that plagues gas piston systems carrier/ buffer cavitation is still commonplace in gas impingement systems. We decided to focus our joint design efforts on that to help reduce any unnecessary movement that comes from the "flat on flat" relationship that the carrier and traditional buffers have. The end result is a smoother running version of the A5 system and a superior buffer system (when compared to dated carbine buffer systems). Specifications for Cobalt Kinetics A5-CK H0 Buffers: Manufacturer: Cobalt Kinetics Color: Black Gun Make: AR Platform Buffer Tube Length: Carbine Length Buffer Tube Size: Mil-Spec Package Contents: Cobalt Kinetics A5-CK H0 Buffers Cobalt Kinetics A5-CKH4: A5-CK H0 Buffer Black