I've never shot a Remington, so can't make the comparison to an 1100 or 11-87. I do own a Mossberg 930 and a Browning Gold. The gas systems are remarkably similar between the two. There are no rings to replace on my Mossberg. Some versions may have them as the owners manual does list an o-ring as a part, but notes that it is not installed on all models. The craftsmanship on the Mossberg is maybe 3.5 out of 5 stars. There are some tool marks, but they don't seem to affect the performance of the gun. The bluing is not as well done as the Browning, but I didn't pay as much either. I can say that the Mossberg has reliably cycled anything I put through it so far. When I pull the trigger, it goes bang. And sometimes a clay turns to dust
I suspect most Remington owners will likely report the same thing.