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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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