Spring for
Nerf Elite Retailator
Nerf Rampage
Nerf Rebelle Messenger
Nerf Triad
Note:
For Retaliator
Please remove the "Bolt Lock" in respective blasters to enable installing.
(Google for Rampage / Retaliator bolt lock peekture for reference :3 )
8 kg load for spring specs.
For Traid, need engage some effort to put the spring in place :)