Abstract: A tether-less recoil kit for a weapon having a trigger with a receiver insert, an air connector plate, and a high-pressure air drum magazine. The receiver insert is configured for attachment to a receiver of a weapon and has a charge chamber and a bolt carrier. The charge chamber has a plunger extending through a rear end of the charge chamber and an air-receiving nipple configured to receive air into the charge chamber. The air connector plate fluidly couples the high-pressure air drum magazine to the receiver insert. The high-pressure air drum magazine has a high-pressure chamber within an outer housing and an air regulator configured to selectively pass air from the high-pressure chamber to the air connector plate. When the bolt carrier impacts the plunger, a burst of air may be released from the air connector plate into the charge chamber.

Abstract: Systems and methods for modifying the trigger assembly of a firearm to create different trigger pull weight stages during a pre-travel phase of the trigger, wherein the trigger pull weight of the pre-travel phase is greater than the trigger pull weight at the trigger breakpoint for the hammer to be released.