On Reflection I didnt fancy my barrel chaffing away on the bottle - so I have designed and printed my own.
loosely based on the tube version clamp - but in PLA so I have made it chunky.
this was version11 and it slips on super snug and makes the barrel feel rock solid
It could be fitted anywere on the bottle - but I like the idea of having it on the end of the bottle, closer to the end of the barrel and offers some protection.
#Giles - let me know if you would like me to post one to you, so you can let me know what you think of it,
Personally I cant believe that FX have made and supplied one.