Long Range Shooting School and my Grendel?

[Drifter]

Is there another option besides the Danial Dfense. A little more than I wanted to spend.

Troy has one:

http://www.cheaperthandirt.com/77169-1.html

There are quite possibly some cheaper foreign-made options.

Do I need the tool to remove the existing handguard?

Not necessarily. Perhaps you might try it to see. If you can't get it off, order the tool.