Removed the safety from a used S&W M&P CA Compliant 2.0 9mm compact and ended up with this leftover part. Can't find video or Manuel explaining what it does. The gun still runs normally, haven't had any issues. Does anyone know what this thing is or does?
Is it possibly the magazine safety lever? Will the action function in double action without a magazine in the gun? Going through the M&P parts in Numrich that is what it appears likely to be.