Hello I`m quite new to airsoft, started like 4 months ago with a cheap gun ~100$ M4A1 Cybergun The gun suddenly died and I decided to don`t send it to the warranty but to completely change it to another level. I started searching in the forums and on YT and I made a new build. Parts I used: SHS gears 16:1 SHS bearings SHS double o-ring cylinder head SHS Cylinder SHS Aluminium 14 tooth piston SHS double o-ring piston head 30k Boost motor Titan V2 advanced M120 spring Metal spring guide with ball bearing New tappet plate M4 Aluminium air nozzle (21.4mm) Battery Novritsch 11.1 2600ma Maxx Hopup unit Changed the inner barrel from 295 mm with Prometheus 6.03 407mm Hopup bucking purple Prometheus (soft) After all the integration process I encountered the first problem. At the first sight, my gun was not feeding properly. Because it was already Friday and I could not get a new nozzle till Sunday (airsoft day) I put a 2mm gasket between the gearbox and hop up unit. The good news was I could shoot with the original magazine but I could not with 120 midcap magazines. With midcap magazines, the bb was traveling around 15-20m and fall down (was like was unhoped) I will try to change the air nozzle but firstly I would like to get a few more opinions from people with more experience. After the airsoft day: If I shoot quite fast after around half magazine (350X0.25bb) the handgrip gets warm. Is that normal for such a build? The peak current measured by titan is 121.6A. Is that normal? I will attach photos with the old parts, with the failure spur gear, with the new build, an with titan statistics.