You know those 'slip-over the barrel to make it look shorter' style xm177 flash suppressors? How long are those from where they attach to the barrel to the tip? I'm just wondering because I have a 14" barreled Bushmaster with a 2" flash suppressor permanently pinned and wanted to remove the current flash suppressor and put on the slip-over xm177 style one... once on, would it be long enough to cover the 2 inches? (the one I'm looking at can fit over heavy M4-style barrels like the one my Bushmaster has)