Biathlon cocking lever aids designed to fit the Air Arms HFT 500 / S510 / S500 / EV2 cocking lever.
These cocking aids are a tight push on fit and make cocking the S510 easier and more comfortable.
As well as making the lever easier to find and use during night time shooting or follow up shots where you don't want to lose head position looking for the lever.
There are 2 variants of the lever:
Single Sided
Double Sided
Choice between the two is down to your personal preference on looks and feel as they both do the same job.