ok the 527 is a different animal that is the new brno fox, which is the 223 lenght mini mauser action. nice rifles but I sold mine in favor of my ar.......GASP HORROR, I know.
the cz rifles are nice, if you can get one with a bit of checkering on it. I upgraded my stock and am pleased with the extra grip.
I cant see me ever parting with my brno mod 2, but I dont care for my ruger at all. even after I sorted out the trigger at nearly half the cost of the rifle again.
CZ on the other hand can be sorted with a spring and shim kit for 30$
the 452 I believe is the 22lr the 455 I think is the 22mag length that you can also get a 22lr barrel for.
Personally I dont see the point of switch barrel designs when youd have to resight in each time you changed over
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