You need to remember that the compensator is going to protrude from the end of the gun and make it markedly longer. Probably at least 1 to 2 inches. That means a possibility of a new holster being purchased. It will also make it quite a bit louder, maybe. Usually they do make the bark get louder, sometimes though you can get lucky and they will not affect the sound too much. You will also have to deal with the associated spray of fire and lead, dirt shavings coming out the ports. I have the XD9SC myself and don't really feel like it needs the compensator. Especially considering some of the downsides of dealing with one.
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