Check the listing for details. HK Army Sonic Electronic Paintball Hopper Loader - Black. Condition: New. Listed at 99.95 USD. HK Army Sonic Electronic Paintball Hopper Loader - Black The HK Army Sonic Paintball Hopper is the next generation of proven paintball technology! The loader's toolless shell is made of durable nylon material to prevent cracking and shattering from impact, and features a toolless removable tray for easy cleaning and maintenance.