Try lubrication on the toggle slides and pins. They should work smoothly, grim and dirt over time gums them up. Do a good cleaning. Also the spring and recoil lever need to work freely. The pistol seeks a careful balance between these moving parts, the power of the load in the cartridge, and the firm grip - not a limp wrist. Then it recoils enough to cycle but not so much that it hits the toggle stop too hard, as it has no buffer like most modern automatic designs.
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