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i would engrave the lower really, you may want a 22lr upper on it in the future or other caliber and if you engrave the upper it may limit you only to that upper.
If I SBR an AR, I am gunna have like 5 uppers of different length and caliber so I would reccomend a lower unless you just know you don't want another caliber or barrel length.this is true, and some people actually do wear out barrels, that or they changed lengths too.