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
Blaster Mod Upgrade 4.5KG Spring for Nerf N-Strike Reflex IX-1 Blaster Toy - BlasterMOD
My first nerf mod! The micro jolt with a spring powered catch. : r/Nerf