New to forum, hope I am in correct forum for Q&A. Recently purchased a WINGUN .44 mag (dirty harry style), put a few rounds thru it with "green gas", switched to propane and after <100 rounds the gun will no longer hold propane. Total charge leaks by in 4-5 seconds. Like the gun and want to put it back into operation. How to video/explanation on suggested repairs GREATLY appreciated. Thanks!.