Get a set of automotive feeler gages and measure the gap between the front of the cylinder and the forcing cone at the rear of the barrel from both sides. Post the results here and someone will tell you if you have a problem. A gap between .003 and .010 is probably within factory spec for new S&W revolvers. Less than .003 can lead to binding when deposits build up on the cylinder face. Over .010 will result in the escape of gases and unburned powder to both sides of the gun, although some shooters get decent accuracy with that amount of gap.
Also, see if you can move the cylinder back and forth in the frame when the cylinder is closed. If there is significant movement, that's called endshake and can be adjusted with shims.
That's assuming that's what the "someone" referred to when they said to mind the gap.
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