Does anyone know of any hammer springs for the we m4 that have increased strength?   I'm working on a "supar sekrat" custom build that will need one in order to work.   Long story short, it will be using a co2 magazine from a different mfg, and the we hammer doesn't seem strong enough to depress the valve all the way.   I've seen old tsc brand springs on some sites, but nothing in stock. Anyone have any suggestions?