Crappy pic, but you get the idea. Springfield Armory “Loaded” Model, new-to-me, 2017ish edition I believe. Just past the 500-round mark under my ownership and I see that a pin is working its way out of the front sight as shown. Likely happened during 200-round range visit today. What size hex / Allen wrench (or other tool) can I use to lock this back down (perhaps with a drop of Loctite, to boot?), or is this a job for Springfield Armory Customer Service to tackle? It would seem I could easily correct this myself - what say my fellow Addicts?