Rival Hammershotty - a 15round Hammershot Mod. If there is enough interest, I may put this mod kit up on Etsy. Let me know if you would pay $20 or so for
Radioactive - Mega XL and Demolisher Rocket Hammershot Barrels - YouTube
NERF Mega XL Boom Dozer Blaster, Largest Mega Darts Ever, XL 6-Dart Rotating Drum, 6 Mega XL Whistler Darts, Pump Action (1 Count) - Walmart.com