Well i received the email and this is what they say: "We thank you very much for your inquiry. Our latest M16 series. We make a new gear box. Now the new gear box is totally fit with the MARUI." So im guessing that the new gearbox is just as reliable as a TM, thats pretty good up to what I know lol.
Edit/ I was on their website and they had something on the UMG. "Due to the recently discovered smaller 'bug' in the tappet plate of the UMG released last month August 2005, we have decided to help our customers further."
http://b2b.guay2.com/modules.php?op=...rder=0&thold=0 thats the article.