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No only Ruger SR9c/SR40c

I will say maybe I know they will fit the full size sr9 magazine I would get on and try it (any friends with the SR9c or SR40c that would let you try it off their magazine)

Darren, no Sir, it will not. This extension will only work on the "Compact" Magazines of the SR9c® & SR40c® according to Ruger. ----: http://shopruger.com/SR9c-SR40c-Finger-Extension/productinfo/90343/