They don't work well for reducing muzzle flip or recoil. An extended ported barrel is FAR more effective. A proper barrel mounted comp is the only way to get a comp working right.
I saw one in The Sportsman's Guide some years ago when I first go into shooting. I had this innate distrust of the device but gave it a try anyway.
It didn't really do anything to prevent muzzle flip, but the weight of the thing prevented the gun from cycling my local range-brand reloads. (Lightweight stuff.)
What makes the compensator work is its ability to vent as much of the gas out the ports. The comp is usually screwed to the end of the barrel and the bore hole is as close to bore diameter as possible without getting hit by the bullet to help to seal the gasses and allow them to vent out the added ports. Since the bushing type comp must slide back and be bored out far enough to allow the entire barrel's outer diameter to go through it, you lose a lot of the gasses blowing around the space around the bullet. More gimick than a functional comp.
Not worthless, at all! I replaced the standard bushing on my 1911 with an extended "comped" bushing. Then I repalced the upper & mag with an old Ace .22 LR conversion unit. When I go to the range and set up on the far end from other handgunners (so they cant't immediately see the size of the ejected cases), the questions I get as to what kind of compensator (or suppressor ) I'm using are PRICELESS!
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