I bought my PC shield about a month ago. The first range visit I fired 250rds. The last 50rd were 125gr +p. I noticed the front sight fell off during those last 50 rds. Unfortunately, I was unable to find the fiber optic insert.
Later, I called S&w and the rep said the received a bad batch of sights from hiviz. The rep said to call hiviz and they would take care of it. I called hiviz and they sent me out two more front fiber optic inserts for free. After installing the insert, I shot about 100 more rds with no problems. I am however switching the trijicon hd xr sights becouse I want nightsights on my carry gun.
I have had a problem with the front roll pen moving out to the right, which prevents me from sliding the take down latch. I even posted a question on the forum but I one really had an answer for me.
Hope this helps.