Welcome! Their priority is selling complete firearms, so any new barrel runs are dedicated to those instead of acc barrel, you'll find plenty of those complete firearms available with the exception of the 30-30, Bud's has all of them in stock. Due to the plant closure at Gardner and subsequent move to Ilion, H&R production was cut way back for 2009 and they're just now getting caught up. Unfortunately the closure of the Marlin plant may take a toll on H&R production since they make all of their barrels for them, on the upside, Ilion has a new barrel plant coming online sometime this year which should help a lot with availability of acc barrels.
Tim