Took the plunge and bought a storm lake barrel to convert my M&P 40c to 9mm. Bought 2 factory 9mm mags w/ finger extensions from cheaper than dirt. My question now will be if I will need a new spring. I guess I will just have to run a couple once I get it and see if the 40 spring is to stiff for 9mm or not. Also bought me a TLR-3 light for it.
Has anyone tried this conversion and what did you find with the stock spring?
Has anyone tried this conversion and what did you find with the stock spring?