The gas port on your Remington 1100 is located inside of the collar that slides over your magazine tube. If you have a Magnum barrel, it will only have one gas port. This is usually 3" or 3" 1/2 chambered barrels. On 2 3/4" barrels there will be two ports.
1. Lock open the action.
2. Unscrew the barrel retaining nut from the magazine tube.
3. Remove the spring retaining cap (cautiously) and remove the spring.
4. Slide the forearm forward and off.
5. With the action open, slide the barrel forward away from the action. The barrel will have a large collar on the bottom. Look inside the collar, toward the top of the barrel. You should see a small hole (or two) along the rim of the inside top of the collar.
6. All debris should be removed from this port, but care should be taken not to scratch the inside of the barrel, or create a burr on the port.
7. Clean the magazine tube and carefully inspect the rubber o-ring for nicks, cuts or wear. Replace often.
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