Machining a new bolt tomorrow for my 15' barrel high power artemis p12. ,the probe takes up 37 percent of the 177 barrel making it harder to get air past it. Today i took the probe off and used a tool i made to seat the slugs.And my groups tightened. Also power really increased .I had to tune the gun down which gave me a higher shot count.So im looking forward to the bolt build.
