Apologies if this has been done to death, but I'm a newbie to pistols.
I was browsing the M&P Shield as a companion to my Barretta 92FS 9mm. I'm not fixated on this particular gun, but just trying to learn more about the different choices.
The SW site describes that the Shield is available in 9mm and .40 calibers. What is the difference?
I have plenty of 9mm ammo in my stockpile at this point (for the 92), so that would be more efficient, but I don't know anything about 40 cal.
Any opinions would be welcome.
And I should mention that NJ does not allow carry unless you are in LE, so these are strictly range and HD guns here, if that makes any difference.