Standard forends will fit all barrels, Superlight rifle up to and including the standard 12ga shotgun, even the 20gaTDC(dunno about the 12ga TDC tho), but as John stated, you may have to make some adjustments, all barrels pretty much are the same diameter at the forend position, some will just fit with more or less clearance. I had to hog out a synthetic forend for my 20ga TDC barrel right where the chamber swell fits just ahead of the spacer, but the barrel channel is fine.
Tim