Nerf Jolt (Modded), Hobbies & Toys, Toys & Games on Carousell
Yamix NFstrike 4.5KG Upgrade Spring for nerf n-Strike Jolt Blaster, Blasters & Foam Play - Amazon Canada
Hasbro updated their stinger from having a traditional jolt air-restrictor spring to a plastic air-restrictor spring. (More of the changes/updates to the stinger are in the comments) : r/Nerf