Rich I could be wrong on this but I believe the biggest difference would be that with the CSMG barrels you would have to have them fit to your gun were as Simmons takes your receiver and dose the fitting for you so you get back a finished gun. I am pretty sure Simmons will be at the Vintagers and will have examples of the finished product. Perhaps there will be some pictures taken and posted for those that don't attend the show.
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