New to the forum here, although I do own two Walther LG300s. I am in need of knowing the proper size of the pellet/bolt probe o-ring .177 caliber. I live in the States and our source for Walthers and parts has decided to no longer sell parts outright, the action must be sent to them for "repairs". If anyone here could provide me some info on how to go about this it would be much appreciated. I do not want to remove the existing ones until I have proper replacements in hand. Thanks.