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I've owned several semi automatic competition guns with compensators on them (porting of sorts). They work best on the smaller calibers with lighter bullets such as the 9's and 38Supers, etc. With larger calibers they simply aren't as efficient when it comes to reducing muzzle rise between shots. Selecting the best powder for the load makes a difference also. With the right load and caliber the gun is pretty stable and allows faster follow up shots. They are more useful for shooters who shoot timed events at steel plates. I once had a Glock in 40 cal that had a ported barrel (a 23C) and it was more hype that good results. I really couldn't tell the difference between that gun and my model 23 without the ported barrel...other than the muzzle blast. It was much worse with the ported barrel.
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