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This part is used in conjunction with pistons on firearms with fixed barrels such as rifles and submachine guns. This piece is used in place of the piston booster spring and is needed to use pistons on the Osprey 2.0.
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
