As a consequence of British fears, the Indian infantry's long arms were modified to be less accurate by reaming out the rifling of the Pattern 1853 making it a smooth bore and the spherical / ball shot does not require greasing, just a patch. This greatly reduced the gun's potency and effectiveness, as did replacing the variable distance rear sight to a fixed sight. This became the Pattern 1858. However, due to the now thinner walls, the barrel would bulge and bursting was not an unknown problem. Furthermore, with the bayonet fitted excessive flexing became an issue. To remedy this, an urgent order was placed in England for around 12,000 new barrels made specifying with a thicker barrel wall. This became the very scarce Enfield Pattern 1859 which in good to very good condition attracts a premium.