I also have had a HW that my brother still has and it shoots a little smoother and a little faster but is much harder to cock and is not as easy to take hunting for a couple of hours. Very nice for a springer too, it is the 58S one. The 124 shot excellent offhand and I didn't use any ridiculous techniques like the artillery hold either. I only shot it offhand and if target shooting the gun rested on my hand, gripping it, and the butt was on my shoulder. I smoked chipmunks at 50y with it, and pigeons off of a multistory old school. My lockup has never gotten loose but I did button a piston on one. Lastly, they are springers, I have shot the 300S too, and they are all violent compared to a PCP. The harshest that I have shot is probably a nitro piston Crosman, but even that shot dimed sized groups at 20y. I have seen a Gamo Whisper that could not shoot anything under 3" at 20y, except for one pellet that gave nickle sized groups. It is highly possible that people who are having accuracy problems just have not found the right pellet either. I fixed a Benjamin once making brass barrel shims to replace the factory plastic ones, but even that didn't feel loose. So yeah, I shot and worked on a number of springers too and I have come to the conclusion that they were great in their time but if you are going after smooth and accurate your path should lead elsewhere. All the springers feel and sound different, that's why people seem to still like them, you don't get that feedback from PCP, and you don't get people asking how to shoot their PCP accurately either. Regardless, the FWB124D was great in it's time, and is still a good springer, that never gave me a build or accuracy problem in 40 years. Maybe I am just lucky, or I got ones made early in their tooling cycle. They are definitely a pain to take apart, very long spring. To the OP, I would say to keep trying different pellets in different weights, and seating depth.