If you are talking about the letters stamped in your barrel I woiuldn't even worry. The letters in a model # designate stock type, barrel contour and whether blued or stainless. The letters after the 110 on your barrel won't mean anything to you, all you need to know is sporter or varmint, blued or stainless if you are talking about take-off barrels. Aftermarket lets you choose your preferred twist and length aas well as the other things I mentioned.
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