Tuning Air Venturi FWB 124 spring and seal?

I am going to have my 124 rebuilt. Is there anything wrong with these [arts?

I know most will suggest air rifle headquarters but I already have these parts as I had a discount code plus some bullseye bucks and bought them a while back when I received my FWB. At the time I didn't even think they might be considered sub-par, now when I am contemplating using them I thought I would ask.

If they are considered poor quality then I will just discard them and purchase the ARH parts, if they are decent replacement parts I will use them.

TIA!
 
They ARE ( ARH parts )

Thanks

Interested in seeing how it turns out when you're done. The 124's are an impressive air rifle when you balance it's cocking effort with it's power. Not to mention excellent accuracy. Mine cocks like a toy but shoots the JSB 8.44gr (4.53mm head) at 800 fps in good air. Meaning high BP. The other day I was curious what lighter pellets would do so I filed down 3 of the same JSB pellets to 7.7 gr. Actually weighed to 7.7 gr. The 3 shot average was 829 fps ! I'd say mine is right at spec. When I had the barrel off the tube I shined a light down the transfer port and my piston seal was this color.

Screenshot_20210727-192549_Chrome.1627439170.jpg


So I don't know if my seal is actually the Mongoose seal or another maker producing them in the same color. I do know that color changes do occur by the same manufacturer. I also have a couple actual new Feinwerkbau seals that are black.