just bought a .22 mk1 scorpion pistol serial no ra 3772 for £65. Stripped it down had it re blued and spent
£100 on refurbing it, it was only doing 3.5 ftlbs. After new spring, metal piston head, o ring and buffer washer it was doing 5.9 ftlbs. Before that i had a hw45 better built pistol but in my opinion not as accurate and the best it would manage was 5 ftlbs