Editing Lee–Enfield (section)

===Muskets and shotguns===
Conversion of rifles to smoothbore guns was carried out in several locations, at various times, for varying reasons.

SAF Lithgow, in Australia, produced shotguns based on the MkIII action under the "Slazenger" name, chambering the common commercial .410 shotgun shell.{{sfn|Skennerton|2007|p=379}} Commercial gunsmiths in Australia and Britain converted both MkIII and No. 4 rifles to .410 shotguns. These conversions were prompted by firearms legislation that made possession of a rifle chambered in a military cartridge both difficult and expensive. Smoothbore shotguns could be legally held with far less trouble.

RFI, in India, converted a large number of MkIII rifles to single-shot muskets, chambered for the .410 Indian musket cartridge. These conversions were for issue to police and prison guards, to provide a firearm with a much-reduced power and range in comparison to the .303 cartridge. A further likely consideration was the difficulty of obtaining replacement ammunition in the event of the rifle's theft or the carrier's desertion.

While British and Australian conversions were to the standard commercially available .410 shotgun cartridge (though of varying chamber lengths) the Indian conversions have been the source of considerable confusion. The Indian conversions were originally chambered for the .410 Indian musket cartridge, which is based on the .303 British cartridge, and will not chamber the common .410 shotgun cartridge. Many of these muskets were rechambered, after being sold as surplus, and can now be used with commercially available ammunition. Unmodified muskets require handloading of ammunition, as the .410 Indian Musket cartridge was not commercially distributed and does not appear to have been manufactured since the 1950s.

Numerous attempts have been made to convert the various single-shot .410 shotgun models to a bolt-action repeating model by removing the wooden magazine plug and replacing it with a standard 10-round SMLE magazine. None of these is known to have been successful,{{sfn|Griffiths|1998}} though some owners have adapted three-round magazines for Savage and Stevens shotguns to function in a converted SMLE shotgun, or even placing such a magazine inside a gutted SMLE magazine.