Originally Posted by HalfSwiss

Don't have to remove the barrel just to clean the exterior of the barrel. There are several "clips" that are molded into the polymer "disk" at the muzzle end of the handguard. Just apply easy pressure to each of them in order to release the disk and pull the disk off the barrel. You can then get between the handguard and the barrel in order to clean the exterior of the barrel.

BTW, I do have the ShooWrench. It's an excellent tool for the 15-22.