I decided to just clean my gun after a range visit and decided to go ahead and put the Storm Lake barrel in the .357SIG and try it again, it might have been an error or in reassembly at the gun store that caused the slide to get stuck with the barrel, of course this time I took my time and cleaned the gun as well as lubed the barrel and put it back together and will go shoot it tomorrow, after posting this update I am in the process of loading all my mags with 357SIG (5 of them two 10 rounders and 3 15 rounders) I guess I'll shoot up the first 100 rounds pretty quickly this way.

I am now satisfied that this new barrel will work as expected and give me yet another caliber and actually even a new weapon that fires from one of my M&P might have to buy mare mags is the only problem to avoid confusion if I decide to change barrels but that is another topic!

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59,M&P9,40,40C,357,(2)45,G26