Same here, .17M2 to 500S&W which is the largest of all rifle barrel, ALL forends including the BC Carbine forend fit them just fine, there's very little difference in barrel diameters at the forend, Superlight barrels have a little more space in the forends, but even the 500S&W and 308 bull barrel take the same forend as the Superlight. If you look at the H&R retail parts price list, there are no forends offered that have special barrel channels in them other than those for the USH and 10ga, the TDC forend also has the same barrel channel, but it's relieved a little at the spacer, those are the only differences.
Tim