For those who still own the the Tokyo Marui P226 gas blowback pistol. Adzzzys Armoury got a fix that you can follow... "A problem I have seen more that once with the Tokyo Mauri P226 GBBP where it will suddenly refuse to firing any more due to a broken valve knocker. This can any time when when firing and stops all function of the RIF. Here is a simple fix using a replacement part from guarder to solve the problem."