I have a WE mag that fits in my TM 5.1. However, the slide that pushes the slide catch up when empty doesn't mesh properly, so my 5.1 will continue firing even when its dry, otherwise no issue.
"The hydrogen economy car from the people who brought you the 'Hindenburg
'" - Glen Foster
Condoms do not guarantee safe sex any more. A friend of mine wore one and was shot by the woman's husband!