My VP9 has issues where it will not lock back on last round. I can manually lock my slide back but if I drop my empty mag the slide will release automatically. I love my VP9 and have put over 3000 rounds thru it. I keep it clean and properly oiled.
More than likely you're doing it with your hands. I had to readjust my grip for the VP9.I have 6 mags and it dose it with all 6. I am wondering if my slide lock is worn-out. If I manually lock it back and shake the pistol it will slide forward. Set it down after firing a cause and it sometimes slides forward. Drop the empty mag and it will slide forward. I was in an instructors class and had this happen repeatedly. Switch to my G17. I really love my VP9 and was upset by this issue.
Do we get to see the video?Not grip video confirms that