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.