I have mixed emotions about my barrel. On the one hand it balances great. On the other hand it forces a smaller front sight which im not crazy about. My draws from concealment average around 0.8 seconds and when they are misses or slower its because the front sight was missing. It normally points so well that at 12 yards and in its not a huge issue.
I think with the standard barrel you're using the front sight will be easier to work with at speed. I know Im faster with my m64 vs m64-5.