Geissele Super ACR for Bushmaster 4.75lbs Black. The Super ACR has a total pull weight of approximately 4.5 lb with a first stage weight of approximately 2.5 lb and a second stage weight of approximately 2.0 lb. NOTICE: Follow all Busmaster removal and installations to install this trigger. This trigger does not come with a Geissele hammer spring. The original Bushmaster hammer spring must be used with this trigger. Specifications for Geissele Super Acr For Bushmaster Acr Trigger: Manufacturer: Geissele Color: Black Trigger Shape: Curved Trigger Pull Weight: 4.25 - 4.75 lb Trigger Pin Size: Standard Mil-Spec Pin Country of Origin: USA Package Contents: Geissele Super ACR Trigger for Bushmaster ACR Geissele 05-240: Super ACR for Bushmaster 4.75lbs Black