| CPC F41A 19/16 (2013.01) | 16 Claims |

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15. A method for adjusting the trigger pull force of a given firearm, comprising:
providing the trigger assembly having a housing and an adjustment fastener accessible on a bottom surface of the housing, wherein an adjustment spring is in contact with a portion of a trigger of the trigger assembly and exerts a first spring force against a portion of the trigger; and
adjusting the spring force exerted by the adjustment spring by turning the adjustment fastener without removing the adjustment spring, wherein the housing includes a scale marked on the housing and an indicator line on the adjustment fastener to determine the trigger pull force after adjusting the spring force by turning the adjustment fastener.
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