Thanks for the input! Looks like canted sights is the big inspection issue, in addition to the normal "walk around"
I'd also check mag fitament. Between the two I had, one would accept double stack mags with ease, the other took a little filing to make it fit better.
"But when it's time to fight, you fight like you are the third monkey on the ramp to Noah's Ark; and brother, it's startin' to rain."