Either the spring that resets the trigger has weakened, broken or otherwise failed, or the additional back-pressure of using a suppressed barrel has blown some crud into the recesses in the trigger group and there is some unseen buildup that is causing the trigger to hang up.

If the Volquartsen trigger group can be completely user-disassembled, I would strip it down and soak everything metallic in Slip2000 for 48 hours or so, then lube and reassemble.

First, though, you should give Volquartsen a phone call, 712-792-4238. I've dealt with their tech folks before and they are usually very helpful. They may just ask you to send the trigger group back to them for cleaning and adjustment.

Quoted: It must be something in the trigger group itself then. I tried switching the hammer springs between the two trigger groups, but still got the same malf. w/ the volqu. trigger group. I'm getting ready to leave for the weekend so I'll give them a call when I get back on Monday. Really wish the good trigger was working right...going to be a shoot-off of sorts against a bunch of high dollar air-rifles. The stock trigger group opens my groupings WAY up. With all the smack I've been talking the last few months about the "BB" guns, I need every advantage I can get.

If you want, I have a match trigger group built by Randy at CPC that you can borrow for the weekend. If you've got time to stop by and pick it up, let me know and I'll go pull it out of my rifle.