Garand loose handguard

Recieved my cmp danish garand about a month ago. The front handguard is loose, moves front to back about 3/16". Would It be OK to make a shim to go between the gas cylinder and the handguard to prevent the movement? It is so loose it rattles. Rifle shoots good a bout 2" at 100, just want to make it better and keep it as recieved.

thanks rich