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I have been looking around for a laser sight for an M&P 9 full frame and an M&P .40 Shield and am not having much luck. Any suggestions for an inexpensive one to mount on the rail?

Crimson Trace, with front activation, are the only ones I consider worth having.

Start looking here to figure out which ones you want. Then you can do an internet search by model numbers. I bought one off eBay, even.

I second Crimson Trace.

I find it to be most useful for training and dry firing applications than anything else.