Just got my new Bushy M4 handguards today. I must say, they are great! Bit bigger than the stock carine handguards, and the material is MUCH better. The material that the stock carbine handguards are made from always fell kinda soft and flimsy, not hard like the fullsize. The new M4 ones are just like the fullsize ones as far as material. Heat shield is a bit thicker and they have two sets of vent holes as opposed to one. They give the rifle a great feel. Will try to get some new pics soon. Also got a new trap door pistol grip for it. Same size as the sock on only it has a trap door built it. Just right for a spare firing pin, bolt, and a few springs.
Cudos to Bushmaster. These are GREAT handguards, even if they arent "true" M4 handguards.