Looking for a few specs on the FWB 124. Anyone know the piston diameter, piston weight, piston stroke?
Are you just doing some research, or are you considering purchasing an FWB 124/ or you already have one?
You can make your FWB 124 a much nicer rifle with the addition of the ARH spring/seal kit, AND the right lubes. By installing the ARH spring and seal kit the velocity goes up, while the vibration upon firing noticeably decreases. That's a win-win. The cocking effort slightly increases compared to the factory set-up but barely enough to notice. After you've shot 100 rounds you won't even notice the difference anymore, unless the only springers you are willing to cock are an R7/HW30 or a CZ630.
(BTW, my memory says the OD of the piston seal once installed in the compression chamber of the FWB 124 is VERY close to 1.100" (plus or minus a few thou), but my memory may be playing tricks on me because it's been a while since I tuned one).
Here's the ARH spring and seal kit I mentioned:
http://www.airrifleheadquarters.com/cat ... 265467.htm
For the best results you'll want to get some moly paste and spring tar if you don't have some already. Easily done! ARH also sells a lube package that includes both of those (and another useful lube ) for $24. It's here:
http://www.airrifleheadquarters.com/cat ... 169286.htm
Like I said, if you're only doing research and don't need any parts or lubes for the rifle maybe the links will be useful to someone else.