3. Can I run FULL AUTO with CoolTubz?
The CoolTubz™ are made from carbon fiber impregnated with a high heat epoxy and overmolded with a polymer, similar to ABS. Additionally it has a full length heatshield installed.
An occasional mag dump/rapid fire should be ok, each CoolTubz™ has a full length heatsheild installed. However if you want to do a "Ted Cruz" bacon frying demonstration, or have a "slide-fire" type of stock, the answer is no. Stick with your aluminum handguard. There is no warranty offered for mag dumps or full auto use.
Normal use should offer no problems.