The single biggest issue with Matechs has already been stated. It's the fact that the pin walks and allows the aperature tower to become off axis and not grab the detent.
I happen to love Matechs though.
How I prevent this is by dissasembling the entire sight, and lightly grinding a little bit off of one end of the pin. Then, when re-assembling, I use an auto punch to stake the body and capture the pin so it can't walk. I do it both sides as well so it can't walk either way.
I've used Matechs for 6 years now, including one that went through a deployment in the box, and with this little mod, none of the ones I owned or have owned have ever had the errant flip up issue.
It is missing the point to think that the martial art is solely in cutting a man down; it is in killing evil. It is in the strategem of killing the evil of one man and giving life to ten thousand -Yagyu Munemori
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