My very first gun was the S&W SD9VE that I purchased back in August 2013. The first thing I did was trade out the 8.5 lb trigger for an APEX 6.5 lb trigger. I have since put at least 2000 rounds through the gun, and clean it on a regular basis.

Recently, I've noticed the pin located underneath the barrel, right next to the takedown lever slides out after shooting it. I talked to my local gunsmith, and he told me it was because I was shooting too many rounds through it too fast (I shot about 200 rounds in under 30 minutes). That doesn't make any sense to me, especially since it does it after the first few shots.

Anyone else encounter this issue? - any thoughts?