I was ready to send my 300s out for new seals but after watching the how-to vids (thanks Joe!), I decided to get the parts and do it myself. I finished it up this afternoon and while shooting some sight-in targets I realized that I learned 3 important things from the experience. First, taking it apart made it obvious just how well designed, machined and assembled this gun is. Second, there is definitely a correct order to the steps involved to both dissemble and reassemble it. Third, I enjoy shooting AGs a whole lot more than working on them! Admittedly, I have the mechanical aptitude of a dung beetle but I fought this b!#€h for 3 days. Parts that should just slip in and out clung together like grim death (the rear spring stop was particularly memorable). The actual new breach seal and buffer install was a piece of cake. Well it's back together now. It's shooting JSB 7.3s at 610fps and 1hole at 20yds. If it goes another 45 years before needing to be resealed again I'll be 115 and probably not shooting as much. Uj