Each barrel has a human touch before it leaves our factory; this is in the form of hand lapping.
Hand lapping is essentially pouring molten lead down the barrel to get a direct negative image of the rifling. We then apply our specially formulated lapping paste to the lead cast, which is then moved back and forth along the barrel via a shop made lapping rod. This has 2 main effects on the rifling; firstly it creates a uniform dimension along the whole barrel, or if done correctly, can even put a slight taper towards the muzzle. This taper ensures a perfect gas tight seal around the bullet as it progresses down the barrel, this is most beneficial when using pure lead bullets.
Secondly, hand lapping will increase the surface finish and ensure the lay of the metal is following the direction of bullet travel. This helps to reduce copper build up and maintain better consistency over a longer period of time. It is also a form of quality control, as we can instantly feel from the push and pull of a lapping rod, if there's any errors in the twist and dimension uniformity.