Slightly off topic but have you tried suggesting that the new owner upgrade the bolt to the newer core 4 bolt kit ?
http://www.justpaintball.co.uk/marker-upgrades-accessories/eclipse-marker-upgrades-parts/eclipse-geo-iv-core-upgrae-bolt.html?___SID=U
You could offer to give him £20-30 donation towards the cost of it and it will improve him geo 2 no end
http://www.justpaintball.co.uk/marker-upgrades-accessories/eclipse-marker-upgrades-parts/eclipse-geo-iv-core-upgrae-bolt.html?___SID=U
You could offer to give him £20-30 donation towards the cost of it and it will improve him geo 2 no end