The entire GRAVmag 9S range, including the .177 Edition. 

 

The GRAVmag 9S is a gravity-fed magazine system which fits onto Crosman Steel Breech guns and allows for auto indexing.  

Crosman Steel Breech Magazine 9S 1
Crosman Steel Breech Magazine 9S 2
Crosman Steel Breech Magazine 9S 3
Crosman Steel Breech Magazine 9S 4