Reduced recoil, reduced or absent report, reduced flash in a revolver (you may still get some flash around the cylinder/barrel gap), no flash in an autopistol. If the gun is an autopistol it's fairly common for the gun to fail to cycle properly.
Just to be perfectly clear, the squib itself is harmless. The problem comes when the shooter doesn't realize what's happened and shoots another round down the plugged barrel.
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