Anybody ever tried to thread the barrel on an AR-15 using hand tools (no lathe)? My Bushmaster carbine has the heavy barrel which, as I recall has a 3/4 inch OD. Obviously, that would be hard to get down to 1/2"-28 thread. I have seen this tool advertised that supposedly gets you started straight. But you'd have to start with an OD close to 1/2 inch. http://www.midwayusa.com/viewproduct/?productnumber=465127&utm_source=froogle&utm_medium=free&utm_campaign=649 Wanna kill these ads? We can help!