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Using the advice provided by this forum I rebuilt my D34 using new Vortek seals. I did not replace my PG2 Vortek spring and guide but will consider it moving forward. This solved my problem with stuck pellets. Now shooting >800 fps with tight grouping and consistent velocity spread. I'm a...

Great input guys. Good to know I'm not breaking virgin ground on this. I was concerned about the moly detonating even though we're talking about a very fine burnishing of the stuff. Apparently that's not a concern. I'm moving forward with this process as my plan.

I'm rebuilding my older D34 which has an older Vortex PG2 kit installed. I have seen a recommendation where it is suggested that burnishing the compression chamber bore with a Scotch-Brite pad is a good thing when coupled with a very thin coat of Moly. A red Scotch-Brite pad is rotated to...

I got the gun tore down and its obvious the main seal is shot. This is from an older Vortex kit with delrin sleve and top hat. The seal itself is a two part affair. Consist of a red plastic carrier with a plain looking o-ring. Everthing looks good with the exception of the seal. I have...

Thanks for the set screw comment. I really was having a hard time imaging this could damage a barrel. I'm planning on replacing the seals. Since I have an older delrin Vortex kit which has served me well, I will go back with their seal. Assume this is an appropriate move to make? Cheers...

It's a spring. I've replaced the breech seal so it appears the next move is the main seal. This does appear to be the concensus of the guys reporting back. It's not that old but its highly suspect at this point. Time for a teardown it would appear.... Thanks for your input and all the...

I did consider seals. I replaced the breech seal. The main system was converted to a Vortec spring and seal a few years ago and has been shooting hard based on effects on a pine board. (no chrono). Still, seals would explain things. Probably worth pursuing. Thanks!

My first post. Please be gentle... I have a RWS Diana 34 from 1985 which is still like new. It's been a great rifle and has served me well. Pellets started to hang in the barrel recently. This had never occurred so I was somewhat surprised. I thoroughly cleaned the barrel which made no...