Q: What rings do I need for my rifle?
A: 452/453/455/512: All 455s have 11mm dovetails. Beyond that, the dovetails might be 11mm or 3/8" depending on whether the platform was developed for the US market or the European market. The foolproof way to tell is to take a measurement. 3/8" dovetails will measure 0.5"/12.7mm at the top/widest part of the dovetail. 11mm dovetails will measure 0.433"/11mm at the top/widest part.527: All 527 models have 16mm dovetails.550: All 550 models have 19mm dovetails.
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