The Board of Ordnance, both of its own volition and at the behest of Infantry Staff Officers, ordered production modifications during the rifle's service life. Variations included a carbine with a safety catch and swivel-mounted ramrod, the 1801 pattern West India Rifle (a simplified version lacking a patch box), the 1809 pattern, which was .75 (musket) caliber, and the 1800/15, which was modified from existing stocks to use a socket bayonet. The most common field modification was the bent stock: riflemen in the field found that the stock was not bent sufficiently at the wrist to allow accurate firing, so stocks were bent by steaming. As this technique produces temporary results (lasting approximately five years), no examples found today exhibit this bend.