https://midstatefirearms.com/product/elf-match-trigger-adjustable-ar-trigger-by-elftmann-tactical/

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All of our Drop-In Triggers got a makeover by adding an incremental adjustment knob. The advantage to this knob is to adjust the pull weight by increments by turning it with your finger or any flat tool/coin. The spring in the housings and the notch on the adjustment screw does not allow the trigger tension to change its settings without manually setting it and will not allow it to back out. If it did back out, the trigger will still function just under 3lbs. It is still our normal match trigger as before but even more bulletproof!