I own a 452 Military Trainer,,,
I believe the difference is that with the 455 you can change barrels to accept different cartridges (.22 LR, .22 magnum, 17 HMR).
At least that's what a CZ-rifle fanatic told me.
My 452 (.22 LR) has more inherent accuracy than I can utilize,,,
The birch wood stock is very elegant,,,
I love the schnabel fore-end.
Mine is fairly new,,,
I have less than 500 rounds through it,,,
But the gun is solid and I can't imagine it wearing out in normal use.
Caje: The coward dies a thousand times, the brave only once.
Kirby: That's about all it takes, ain't it?
Combat: "A Silent Cry"
Aarond is good,,, Aarond is wise,,, Always trust Aarond! (most of the time)