That's interesting, I have two shields bought this year, one with a May date and one with a July date. The July build, the pin for the trigger hinge appears to be set too deep on the trigger which then protrudes on the right side of the trigger enough to be felt. The May build is flush on both sites. Both triggers function fine, but the July build pin looks like the one in picture 2 on the link in post#17 and the May build looks like the one in picture 3. Here's the link for those that don't want to go back to the post: S&W Shield missing a spring? - M4Carbine.net Forums