Compensators are interesting devices. They redirect gas to take the bite out of recoil and reduce muzzle rise. There are two types of compensators for semi-automatic pistols: traditional compensators and bushing compensators.
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Traditional compensators attach to the barrel, while bushing compensators replace the barrel bushing and attach to the slide.
Some compensators are called bushing compensators even though they attach to the barrel via threads. They get that name because they include a traditional bushing behind the compensator, but they fall under the definition of a traditional compensator.
Bushing compensators vary by design with respect to important features. Some bushing compensators have chambers and baffles like a traditional design to help trap gas, while others don’t.