Abstract: A firearm operating system is designed for a firearm with a barrel and a bolt carrier group. The firearm operating system includes a gas block secured to the barrel, the gas block comprising an upper hole, a gas plug disposed in the upper hole, a tension nut disposed on a forward side of the gas block, and a removably attached gas directing assembly. The gas plug includes multiple adjustment configurations. The removably attached gas directing assembly interfaces with the bolt carrier group.

Abstract: A suppressor assembly for a firearm includes a rear mount, a rear cap, at least one baffle on a forward side of the rear cap, and a front cap on a forward side of the at least one baffle. The rear mount includes an inner bore, a rear attachment interface, and a forward attachment interface. The rear cap is attached to the rear mount through the forward attachment interface. The rear attachment interface connects the suppressor assembly to the firearm. The front cap includes a plurality of exit holes that allow propellant gases to exit the suppressor assembly through the front cap.

Abstract: An exhaust sound enhancement (ESE) system for a vehicle without an internal combustion engine includes one or more speakers, an amplifier configured to generate and play sounds on the one or more speakers, and a tuned exhaust assembly with a housing configured to resonate, amplify and inter-modulate the sounds from the one or more speakers to mimic exhaust sounds that would be produced by a predetermined internal combustion engine.

Abstract: An active vibration enhancement (AVE) system for a vehicle without an internal combustion engine includes a sensor system configured to monitor and sense an operational condition of the vehicle, a force generator configured to couple to the vehicle and generate vibrations into the vehicle, a controller in signal communication with the sensor system and configured to receive one or more signals from the sensor system indicative of the sensed operational condition of the vehicle. The controller is configured to, based on the one or more received signals, actuate the force generator to generate vibrations into the vehicle that mimic vibrations that would be produced by a predetermined internal combustion engine operating at the sensed operational condition of the vehicle.

Abstract: A vibraphone includes a frame having first and second ends, and first and second rows of bars disposed on the frame. The vibraphone includes a damper disposed on the frame and configured to move between a first position away from the bars and a second position in contact with multiple bars. The damper engages the bars in the second position with a proportional contact area against each bar to provide substantially proportional dampening of each bar.