I have a 28g CSMC RBL that weighs in at 5 1/2 lbs with 28 inch barrels. I can't say that it is any more difficult to shoot than my 6 lb 2 oz Garbi 28g but I haven't shot it a lot.

By necessity though, and stock lengths being equal, that reduced weight has to come out of the barrels mainly, right? How do these guns balance?