I have started a new air pistol build project this year, and this time I have opted to make a copy of something antique, mechanically exceptional, and extremely rare. A generous collector has provided me with detailed pictures, inside and out, of his original example, so I hope to be able to make a reasonably close copy to add to my collection. Those of you who know my efforts will not be surprised to hear that it is springer – so apologies to all the pneumatic enthusiasts.

This is one phase of the project successfully completed. Can anyone guess what the item is and what the gun in question might be?