I want to get a M6 light/laser for my 16 inch colt. I want to install it at the end of the handgaurd but i dont want to have to buy one of those "fancy" handgaurds i see. I just want to get a nice rail that installs to my current handgaurds that will work with the mount on a M6. Can anyone make any recommendations? Will the polymer scout rail thats sold at cavalry arms work for this setup? Any info will be welcomed. Thx.

I am not sure if the mount you mentioned will work.  I have no experience with them but you might look at GG&G in Arizona.  They have rails mountable on standard M4 forends, etc. and are a good company!  I know they make a rail for foregrips, etc.

Good luck

I use the GG&G mount for my M-6, fit was a little tight at first but after a few times on and off it works fine, price was about $48

The other way is the Streamlight mount itself, should be about $16 and screws into the vent holes of the handguards, fits well but it will only mount the M6, no pistol grips or anything.

Holsters plus makes like a cuff that snaps into the vent holes of the forend, and will mount the M6

Denny's GTS makes a rail and they sell the rail/grip as a combo, I have heard that these will mount the M6 and once i get one I will let you know. =)

edited to add : here is a pic
http://www.gunsnet.net/album/showphoto.php?photo=10930&papass=&sort=1&thecat=500

FYI...

Handguards move.  Mounting a laser on the handguard will provide you with a functional light, but a laser that will shift all the time.

M3 will work fine, M6 will not.