Looking at some pics of a Girandoni-type repeater posted the other day on the American Vintage Airguns forum by Mr Fletcher, it occurred to me that a similar system could work on a pellet-firing springer.

The production repeaters that I can think of involve rotary mags (ie prewar Haenel, CO2 revolvers), various lead ball mags (pre and post-war Haenel etc), or inline tubes behind the breach (Gamo, Jackal, prewar EM-GE).

Couldn't a Girandoni-style tube magazine parallel to the barrel be used to feed pellets via a sliding block breech, assuming it could be made airtight? Has anyone seen this done?