All of H&R's modern produced forends have the same barrel channel except some shotgun forends, but some barrels have a thinner profile at the forend, the Superlights are for sure as are the 22Lr and 22mag, but they still come with the same forend as any other H&R including bull barrels, there will just be a little more space for the lighter barrels in the barrel channel. Get the BC Carbine forend for the 22Lr barrel, it will work fine. pre-87 H&R barrels did have thinner profiles, very similar to the Superlights and the 22lr/22mag, just ahead of the barrel swell they reduced heavily in size, then were fairly straight with minimal taper to the muzzle, where modern centerfire standard barrels reduce in size a little ahead of the barrel swell and then taper fairly steeply in comparison towards the muzzle.
Tim
