Gamo Action Breech block.

Suitable for the following air rifles:
– Chacal
– Coyote
– GX40
– GX250
– HPA
– Phox
– Urban
– Venari

Current version has GX-250 .177 model etched on the side but is the same as the other models.
Includes factory fitted front probe guide bushing. They are not caliber specific so even if says different caliber to your rifle it will still work.