Only ever seen (and fondled) one Ainley rifle in my time, and that was in
Australia
, about thirty years ago.
It had come out of a collection in
Canada
that included a BSA SMLE in .276 Pedersen and a whole lot of other goodies I can't remember.
The Ainley I played with was beautifully finished and chambered for an outrageous .276 "experimental" cartridge resembling a non-belted 7mm Remington Mag. or .280 Ross on steroids. The action body had integral "rails" to take some sort of optical sight and the rear "iron" sight was a work of art. Its final version appeared in 1939. Not being adopted may have been a bit of bad luck for the designers and makers, but probably a HUGE blessing for the hard bastards who had to shoot their way into
Germany
and history a few bloody years later.
See the picture in slide 26 of this presentation:
British small arms development The inter war years