New Height Rail Question

[haze1964]

I recently purchased a Bushmaster ORC in .308, which I’ve read have similar specs to the DPMS LR-308.  Mine has the .060” lower rail height.  I’d like to replace the handguards with a mid-length free-float tube.  Not sure why, but I don’t like the round ones.  I’ve found a few quad rail options made to match the new height upper (Troy Industries and DPMS), but they only come in carbine and rifle length.  I was curious if anyone was aware of mid-length option (approx 9”) that would work.  If not, is it feasible/advisable to have a rifle length rail cut down?  If so, what would be the best way to refinish it?  Thanks for the help.