Scheurer 1870 spring gun/Beeman tempest pistol

[AirSupply]

Browsing through an online auction catalog and came across this. Looks like there was a handle you turn in the stock to cock it. 

This pistol was also listed. 

 

[Long_Gun_Dallas]

Very cool! That rifle looks to be of fine quality. Would be interesting to see how it was made/worked.