Looks like the 455 has some nice upgrades though, I like the new threaded barrel vs set screws, and that they opened up the barrel channel to prevent it from touching. It didn't necessarily say it was truely free floated though. Also looks like the machining work was of higher quality in the finishing anyways, less tooling marks hopefully with the same tolerances. It looks to me like either way you'd have a nice little squirrel gun. I will give the 455 a try, just because it will get me another 85 for glass and I don't see anything that is running me off!