Brocock shroud spacer. Available in 2 versions depending on caliber and power

M12 thread (12mm)
Fitted to all .177 and .22 12ftlb / 16Joule rifles. – 17″ barrel

M14 thread (14mm)
Fitted high power 23″ .22 barrels and all .25 barrels regardless of length

If in doubt please doublc check measurement with your barrel.

Fits:
Pathfinder
Bantam MK2 & HR
Commander & XR
Sniper XR