There are people who love their commercial carbines. I would say 90% of them have not shot a nice USGI carbine. The best are ones serial numbered over five million. They incorporate the latest designs. Commercial carbines are not made the same with the same inspection and all parts will not interchange. This could be important in the future to you. And a type 1 band is not the best at holding the barrel. It is the worst, a type 2 is a lot better and a type 3 is the best.
USMC, I sent you a PM.