As best as I can tell thhhey did open up the ports. I do not know how much. The 1100 comes with the 3 gun version. BTW, the Limbsaver recoil pad is sensational. I will be installing them on my other shotguns.
I do not know if they opened the ports, but I assume that they must have. I have fired a lot of Federal Tactical 00 buck and tactical slugs with nary a problem.
Jim Conway
I have installed the LRT and It fires very well. the split times are very fast. A previous post asked it this trigger defeats or otherwise effects the safeties. It does not.
Try it you will like it.