Greetings all, I have had my 510 .177 for about two years and have never been happy with the accuracy, I sort of lived with it after trying every make and weight of .177 pellets, barrel cleaning etc etc. I bought a new magazine as now and then a pellet was getting jammed in the loading port and I could see very slight lead build up around the breech o ring, this made no difference at all.
I then noticed that the pellet probe was not entering the breech centrally if that makes sense at all. On stripping down the side lever I found what was a .22 bush installed... I purchased this gun new by the way. Ordered and fitted the .177 bush plus a new probe and guess what it's even worse

now it doesn't even enter the breech port, how can this be?
The .22 bush obviously allowed the probe more movement hence working to some extent.
Anyone have an idea on getting the probe to centralise?