Transfer port for the Gamo Chacal air rifle.

Available in different power settings:

16-9100 – fitted to some UK spec (12ftlb/16Joules)
16-9214 – 2mm hole – fitted to some UK spec (12ftlb/16Joules)
16-9101 – 4mm hole – High power / FAC

If fitting a regulator it is also common to increase transfer port size