Guys:  I was wondering if their were any effects on bullet velocity or accuracy from adding a flash hider.  I know that a compensator will often decrease velocity not to mention the increase in db towards the shooter, however I have not found published data (accuracy or chrono) on barrels with and without a flash hider.  I would be interested in comparison data that any of you have gathered or observations  that you have made.  --  The reason why I ask this is that I have a 20" Post Ban Colt HBAR that I am considering adding the "evil" features.  The rifle has a crowned bbl with no muzzle device and is a real shooter.  I don't want to sacrifice any long range accuracy with any mods that are made.  The scoped rifle weighs in at 11 pounds unloaded and is quite cumbersome (imo) so I have to determine whether to commit this rifle for long range use (with long range mods only) or lighten the bbl and configure as a fighting rifle.

Thanks in advance for any data, comments or ideas.  -- MT --