Absolutely, the factory recoil lug is stamped by a pig punch press. The result is a piece of metal that in no way is close to being flat. The two sides of a recoil lug need to be parallel as they it is sandwiched between the lug nut and action face. I have ground factory recoil lugs and I can tell you that precision or parallel does not come close to describing a factory recoil lug.
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