The 3,5 kg / 8.0 lb connector is marked with a (+). This is the spring for users appreciating hard "dry" trigger action. It is also characterized by a clearly sensible point of depression. Fits All Glock Models except for the G43,43X,42 48
Installed a Timney alpha competition trigger kit and found the greatest trigger a glock ever had. Problem was the break was to light at 3 lbs. Installed this 8 lbs connector, found a shorter take up and increased the break to 4 lbs. About right for EDC. Shopping was speed of light. Thank you GlockParts for great service and a great price.