I have had numerous people tell me that it was impossible to shoot chipmunks at 50 yards offhand with a (2.5x SS-1 scoped) bbgun and proven them wrong. Of course, most people back then, even today, don't know what good airguns can do, unless they are on these forums.
The old springers are certainly capable... I've had quite a few over the years. The only one that is still in the safe is my Theoben Shirroco (I know... not really a springer). Springers are a wonderfully elegant design though.
Magnums (like a FWB 124) are tricky to shoot well. They will magnify your shortcomings. A shooter just picking one up and expecting performance like you describe will be quickly discouraged. Shooting as mentioned above is much more about your ability than the gun. I don't doubt you at all... I'm impressed.
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