Thanks for helping me win my bet!!! Now, would you know if there are variances on the width of the rear sight between my 439 and the M&P and Sigs? I'm looking for a laser to mount on my rear sights and all I'm finding are sights for the M&P and Sigma models. I hate buying online and returning products without being sure they will work or not. Any advice on what sights may work???
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