KWA mp7 inner barrel

[Sho Nuff]

I recently purchased a mock suppressor for my mp7 and the bb's are hitting it and breaking or spinning off target. Its just too long, looks awesome but totally useless. What I am looking for is if there are extended inner barrels for the KWA mp7 or what would work here. Im running without suppressor now but would really like to use it, makes it look so mean! Any help is appreciated and thanks in advance.