This is a backup for the HDR 50 Home Defense Revolver. The HDR 500
shoots .50 caliber rubber balls, pepper balls, marking balls or chalk
balls, and the HDR 50 Launcher also lets you use Walther PDP propellant
cartridges. Just mount the launcher on the bottom Picatinny rail and
load the cartridges in the break barrel, which pivots sideways.
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