Not really.. just adds great look and feel, as well as durability.
However as far as I know a plastic/stock TM GBB has never been reported breaking from long term propane use. Madmax even has a thread somewhere asking that question. I never had any problems with my stock plastic kit, still have it. Creation FMU kit just happened to be dangled in front of me by a brainwashing ILLusionist, great price, so I took it
