Marked on barrel: Feinwerkbau Oberndorf/N, Feinwerkbau-Sport 124-Cal.4,5.177 Made In Germany 39772, Imported by Beeman Precision Airguns Inc.
Replaced the breech seal with an o-ring. Nothing complicated, just went through the bins until a likely candidate appeared. Frank will find a spare half dozen in the box.
After final assembly, I fired about 100 shots to get the gun settled in then set up the chronograph. The velocity average for 20 shots was 887 fps using RWS Hobby wadcutters.
I think that's on the warm side for a 124. That's about 30 fps faster than mine. The gun has no vibration or twang. Just a very quick punch. Ahhh, almost forgot the important part-how I adjusted the trigger.
Here's the procedure: Turn the trigger adjustment screw in all the way. That will give a 2-stage but heavy pull with a very definite second stage.
Back out the screw about a half turn at a time until you feel the second-stage get lighter-eventually, it'll disappear. Turn the screw back in-in quarter turns if necessary-until you can just feel the second stage pause. That's about as light as it'll get and still give the 2-stage feedback. Shipped the gun back to buddy Frank. He'll get it later today.
So far, the 124 is the only gun I've ever repaired that I consider a compressor absolutely mandatory. I'd be most concerned with the end cap (including the trigger assembly) firing across the room breaking the trigger off in the process.
Also may damage the last thread(s) in the cap making reassembly difficult. It's also virtually impossible to reassemble the gun and manage to install the end cap, spring and safety, while compressing the spring then align for the securement bolt.
Not enough enough hands, dexterity and strength. There's also some probability of damaging a replacement mainspring on reassembly. It'd be hard to compress that much free length of spring w/o it bending sideways. Anonymous said.
Very nice post and thank you for taking the time to publish. I bought my 124 directly from Beeman back in 1984 for the astronomical sum of $360. I have fired thousands of rounds and killed hundreds of small animals since then. My gun gave up the ghost a few years ago and I recently bought the kit FWB 124-127 Pro Mac Kit- NEW from a local smith and installed it today. It fired properly, after a somewhat difficult cocking, once, and since then I have not been able to cock it. It seems like the available travel to allow the sear to engage, may be compromised, I am thinking, by the SS spacer at the trigger block end.
I intend to disassemble and remove that spacer tomorrow to see if that may be a factor. If anyone has any thoughts on this, I sure would appreciate hearing.
Great find you made on that FWB 124. I have two of them, one with a Maccari ProMac tune kit from Air Rifle Headquarters, and the other with the stock spring and seal. The stock one is doing about 750 fps with a 7.9grain pellet, while the other tuned one is doing closer to 850fps. I definitely get good power with the ProMac tune kit I put in it.
However, if i were to do it again, I'd go with the 'New Slightly Softer Pro Mac kit'. Maccari says its 5% less fps, but 20% easier to cock. Here's a link: Unless you want the most power possible, I think the kit above with slightly lower velocity is a good trade off for the 25% more cocking effort I got after installing the regular ProMac kit. The really great thing about the FWB 124 rifles is the extremely low cocking effort of about 20 lbs, making it a lot of fun to plink and shoot with all day. I find I shoot my easy-cocking, original spring FWB a LOT more than the full-powered one. The new kit is great, and has less noise and the shot cycle is faster and more straight back, but its not as 'fun' to cock any longer. Not that the cocking is hard, its still a bit less than my Beeman R9 is to cock.
Just someting to consider if you go the tune kit route. Just a spring/seal replacement would be fine too and keep it closer to original factory speed, with low cocking effort. Let me know if you need more info later on.