If your Umarex Steel Storm airgun CO2 BB repeater is leaking from the magazine these are most likely the o ring seals that need to be replaced. 

It solves the issue with leaking magazines when inserted into the magazine slot.

Each magazine contains 1 x larger o ring and 1 x smaller o ring. Our pack contains:
5 x larger o ring
5 x smaller o ring
Plenty to keep you shooting!

*PLEASE NOTE: These seals will not solve any leaking CO2 when directly screwing in the CO2 powerlet, these are not CO2 powerlet seals. 

It is recommended to use Molykote 111 o ring grease with these seals, and not to remove the magazine from the rifle when not in use.

Umarex UK Dealers

All our products are stocked in our retail shop in the center of Newcastle-Upon-Tyne, UK. We dispatch via Royal Mail and Parcelforce on all working days and if your order is placed before 3pm it will be dispatched same day.