I have one PRI 3rd Gen CF carbine length (shorty) free float tube. This tube includes the lightweight aluminum barrel nut, making for the perfect ultra light free float tube. Surface finish is in perfect condition, but the front 2 or 3 mm of the tube have been turned down by my local gunsmith to allow a YHM 3-way rail gas block to fit (stock tube didn't quite have the clearance). No rails are included with this tube. Asking $180. Will include the 3-way gas block, gas tube (carbine length) and Bushmaster flip-up front sight (missing sight post) for an additional $40.