where is the best spot to mount a light on a carbine, withoout bolting it to the bbl.??  Who makes a good one---was looking @ Wilson Combats---thanks for any input

A rail system would be the best option.  I just added a Knight's M4 RAS and Surefire M962SU to my rifle, and it is awesome.  The rail system also allows you to mount a bipod, vertical foregrip, etc.

RIS RAS or SIR

pick one [:D]

Surefire has one. Go to their weaponlight section.
I think harris has an adapter for their bipod.
But, like the others said, go with a rail system.

[img]http://www.imagestation.com/picture/sraid71/p22aed753ff74b379bfd5861e9b22c397/fb9552bf.jpg[/img]

another approach is what i did, i jus drilled 2 small holes in handguard and attached a mini-rail (about 2-3 inches long) and mounted my light, the light can unscrew from mount at any moment.

as far as bipod , ya can use the railsystem like others have stated or jus get the adaptor that goes inside the handguard.