My FWB 124D , bought in 1979 , serial number 18866. I bought it from Robert Law at the original ARH in West Virginia. I shoot it for many years , but I began to realize that it needed an overhaul. I took it to Steve at Pomona Air Guns ( Baldy Meza , not Pomona) . Steve replaced the piston seal and the spring , then 37 years old. I shoot the rifle regurly , and it is as accurate as ever. Someone who has shot the FWB 124D will marvel how they get over 800 fps from a gun that takes 18 pounds to cock. My HW30S takes that much pull , and for maybe 630 fps. with the same weight pellet.