The Super APC Trigger from Geissele offers a boost in trigger performance over the standard trigger found in the B&T APC9 and APC45 firearms. The while the single stage trigger is not adjustable it ships with a light and heavy spring allowing you to choose between a 2.75 lb. or 4 lb. trigger pull. Trigger Pull Weight Light Spring: 2.75 lbs. Heavy Spring: 4.00 lbs.FitsB&T APC9/45HandednessAmbidextrousTrigger Pull Weight (High):4-4.9 lbsItem ConditionNewUPC817953023341MPN05-685