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They are very much the same rifle with cosmetic differences. The following Rimfire Central post sums it up succinctly (post #6) h t t p://www.rimfirecentral.com/forums/showpost.php?p=6264169&postcount=6
I've only had my BRNO 2E a few months, and, I've never scoped it to really know how it measures-up to my 452. (which is very accurate) However, I wouldn't have bought the BRNO if I didn't think it was. They're basically the same rifle where it matters.