The Walther LP53 was designed as a centrefire match training pistol, the spring is vertical in the grip to produce an interesting recoil and the trigger weight is 1360 gms, and as some one has already said the FWB 65 has a switch setting to increase the trigger weight to the old centrefire weight of 1360 gms and it was designed to have a screw and washer lock the recoil sledge to produce recoil for CF practice. Both are collectors pieces that would grace any collection and the 65 is still a good match air pistol in standard mode.
Best regards
Robin