This manual, as the name suggests, deals with gun barrels. The instructions range from preparing the barrel to fitting the loops, lugs or staples to attaching under-ribs and fitting the gun sights. There is information about barrel straightening and lengthening. There is a discussion about bores, rifled and smooth. Finally, Kit speaks about: electric power equipment; heating, torches and forging and hand tools. The final craftsman’s manual before KIT BITS.