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The adapter doesn't determine the spec of the buffer tube you install. The thread on both tubes is the same. It is the diameter of the buffer tube itself that is either milspec or commercial.
Think of it as screwing a big halogen light bulb into a lamp or a standard bulb. Thread is the same but the size of the lights are up to you.
On a related matter, will these adapters fit a Remington 760/7600 pump rifle? From past experience I know that a 20 guage 870 shotgun rear stock will fit a 760/7600 bu the 12 guage is probably larger (both for stock and adapter). Thanks.