Which is a piece of junk and will swage lead bullets smaller in diameter. This will cause leading from the bullet being undersized and gas blowing by the gap. The FCD is a crutch for people that can't properly adjust their sizing die and is even worse for lead. As I've stated in the thread a few times I've never had a problem with my threaded G30 LWD barrel either. Lot of folks here that talk in sound bites and reiterate ad copy from companies which perpetuates bad advice. Wanna kill these ads? We can help!