Quoted: Still waiting for someone to measure the dimensions of his Bushy Dissy's barrel at the FSB compared to the gas port. Facts needed.. no guessing, speculations and IMO's.
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No offense.... Cant see the forrest for the trees.
There are several way to do what you wish, and they have all been done before.
*speculation*A bushmaster dissy barrel's forward FSB and barrel dia. would have to be smaller than a compairable M4's, Otherwise the rear "gasblock" wouldnt slide into position.
You have several options: Use a factory dissy barrel, But the rear shaved FSB has troubles clearing some FF tubes.. Use a M4 barrel and find an A1 FSB to ream to final I.D.... Use a cut down 20" which needs gas port work to run correctly.... You can even use midlength barrels in this type of build..
IMHO If your going to use use factory handguards and never will use a FF tube then just go with the bushy dissy barrel.
Flame away.......