"stopping power" is irrelevent and mostly a myth. the only things out there i would consider having any real stopping power would be somethng like a 155mm howitzer or hellfire missile. pretty much gaurantted one shot stops.
anyway... its easier to find 9mm magazines and ammo than 40cal.
my preference in 9mm vs 40cal is 9mm. more rounds less recoil quicker follow ups.
good luck finding a cx4 of either caliber ive never seen one in a store.
anyway... its easier to find 9mm magazines and ammo than 40cal.
my preference in 9mm vs 40cal is 9mm. more rounds less recoil quicker follow ups.
good luck finding a cx4 of either caliber ive never seen one in a store.