I recently bought a gun used. The original owner of the gun didn't know exactly what make it was, but he was quite sure it was an echo 1. It was an S-System m4, and the possible makers were JG, TM, and Lancer Tactical. When I searched around for Echo 1 S-System m4 the only thing that came up was this forum. http://www.airsoftcore.com/forum/index.php?showtopic=49230 Could you tell me what brand the below gun is?