Although the Model 1100 and Model 1187 shotguns are very similar in design we do not recommend that the barrels be interchanged between models. The extractors and corresponding extractor cuts in the barrel extensions differ. The locations of the barrel seal grooves in the magazine tubes are in slightly different places. Most of all it is an unsafe practice to exchange parts between models unless it is a documented fact that the different models use the same parts.
You can view a list of extra shotgun barrels through the parts section of our website located HERE .