BSA produced two pre WW1 air rifles for the younger shooter based on the Improved Mod D, being the 'Junior' and the 'Juvenile' Patterns. The 'Junior' was really just a cut-down version of the mid-length 'Light' Pattern, but the 'Juvenile' was purpose designed for this market.

I believe the dainty 'Juvenile' and 'Merlin, to be the only true examples of BSA air rifles specifically designed for young shooters. The 'Juvenile' would have been quite expensive when first marketed though, so it would have been a very lucky child who received one as a Christmas or Birthday present.

Regards

Brian