re: Finally ordered AR stuff,non high dollar gun

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Let me restate my answer.

There are mil-spec lowers and commercial lowers

As far as i know the major difference is Mil-spec requires a smaller buffer tube.

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There are milpec and commercial BUFFER TUBES...90% of lowers are made to the same milspec dimensions, but may not be milspec bc of different coating, metals, etc...

To answer OP's question..they will mate up fine.