The upper to lower fit is unaffected by which tube is used. A mil-spec stock will not fit on a commercial spec tube. A commercial spec stock will go on a mil-spec tube, but the fit will be loose and sloppy. Commercial tubes are 1.17"outside diameter and mil-spec tubes are 1.14" O.D.
As to why they do this, your guess is as good as mine. Some manufacturers don't care about parts interchangeability is as good as I can figure. As long as the parts they assemble at their factory fit together correctly, most consumers never know the difference.
As to why they do this, your guess is as good as mine. Some manufacturers don't care about parts interchangeability is as good as I can figure. As long as the parts they assemble at their factory fit together correctly, most consumers never know the difference.
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Correct, but potential buyers mostly prefer mil-spec. If the price is the same, go that route.
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