Ok so for me I like the large back strap on my gen 4 27 but I have been noticing the pin moving over all the way to one side so much that one side of the back strap is barely held in place. Is this common? Should I get a new pin? Not a real big deal I just recenter it when I am at the range. This is to be my carry weapon and I wouldnt want this to be a problem. Next can anyone confirm if you can get factory glock night sights on the gen 4's? I am looking at getting a 26 and was thinking about getting one with night sights already installed. Thanks.