My question to Mako or anyone that may know... is there any significant changes to the rev 3? Reason I'm asking is i have a few of the 12/12 production and was wondering if I should get them replaced for the newer ones? What specifically was updated besides the mag catch or was that the only change? By the was there customer service was probably the easiest and best I have delt with in a long time. It seems like a lot of businesses in this day and age only care about themselves and making money. And sadly a lot of these companies are firearms related businesses.