I just picked up a first gen sub2000 so that I could learn a little about modding guns. I’m fairly new to this so I apologize ahead of time if I ask stupid questions. I pulled the front sight off to replace it and while I had it off I remembered that I had a spare piece of carbon fiber tube from a previous project. It slides perfectly over the adapter that locates the stock forend and would just need a bushing at the other end. The ID of the tube is .75” while the barrel OD is about .65”. Will this get too hot to hold? Does it need to be vented so that the barrel can cool? I currently only have 10rnd magazines if that makes a difference?