Targets Guy
US Veteran
Okay ... here's what the issue was, got it back from SW. They replaced the slide stop as it had taken a beating when the barrel nut came loose. I had a rubber o-ring on it, but that was not enough to keep it tight.
Soo ... I'll add the wrench to my range bag and check it before & during & after use. I usually shoot 200 rounds at a time, have 1,200 rounds through mine thus far.
First thing I did was get five mags. Then I check the barrel after shooting 50 rounds and tighten IF necessary; I have to reload the mags anyway. O ring solved the barrel coming loose issue.
2,000 rounds and loving it.