An interesting beast the BSA Mk1V, It shouldn't really exist, In 1890 BSA took a contract to suppy 9500 MK1V rifles. Enfield had carried out new build and conversions of the 56,000 Enfield Martinis A & B patterns, and the new production of the 40,000 C patterns from parts in 1887-1889 pruduction year. In the even the order was cancelled, however, BSA must have continued to supply replacement parts up to and including 1897 as I have recorded examples with those dates.
Why should this be?, well, there is no doubt BSA were issued unproofed parts and spares from Enfield as thier production was now to the Lee metford. Testimony to this is the fact that this gun has both Enfield on BSA proofed parts on it. So its Spares and replacements, plus repaired guns which carry the BSA Mark.
The question is did BSA actually make an sell Mk1V's, conceivably yes, but from parts, as theys would have had to re-tool to make very few peices.