I use the red ones, have now for several years and have never had to replace one. Before this Covid crap hit the world, i was getting delivery's in around two weeks from the order but had to wait several months the middle of last year which was a pain. In January i made an order and that took three weeks to arrive, so things are getting better.
The red ones can be machined if you need to adapt it to fit other applications / rifles so these are very handy. So for me the reds rule..
TX200 Mk2. 5.0mm cal. TX200 Mk3. 6.35mm cal. Hw 99s 5.0mm cal. Hw57 5.5mm cal, re engineered pop up breech removed, 22mm piston bore. Lots of others. TAGS member also..