I have had these sights on glocks... we have always considered them to be way too fragile for carry... I have seen several broken ones ... at least the ones that hang off of the back of the slide. Also, on my old glock 22, they used a different height front sight than the newer model rear... or the newer model rear is too low or something...I get so confused sometimes... is it lower the rear raise the front... something...never could figure the thing out and eventually drove it out of my life with a punch and ball peen hammer... 
Anyway...ditched the adjustable thing and installed a fiber optic front and a factory "bucket" fixed rear... much more sturdy and easier to shoot too... 
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"Under the table Greebo sat and washed himself. Occasionally he burped.
Vampires have risen from the dead, the grave and the crypt, but have never managed it from the cat."
"Greebo turned upon Granny Weatherwax a yellow-eyed stare of self-satisfied malevolence, such as cats always reserve for people who don't like them, and purred. Greebo was possibly the only cat who could snigger in purr"
Greebo the Cat - Terry Pratchett "Witches Abroad"
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