I put a TDI handguard rail on my AR that has an adjustable front rail for mounting a laser to.  I just got a laser, and the problem with this setup is that the laser actually sits  over part of the top vent of the flash hider.  I expect that this will be a problem, but I thought I'd check in here to verify my concern before mounting the laser to a more remote and innacurate place on the rail system.

If my description is unclear, I will take pics tomorrow night.

Dont even try it.

Move the laer to the parts box. Or get a cary handle mount  attachment for $10, sight it in, and remove it with a reliable return to 100 yard zero. It is only for night anyway.