This has been done for the Recon, but not for the Retaliator- UNTIL NOW MUHAHAHA!!!
Step 1: Materialz
You will need:
Nerf Longstrike barrel
Nerf Raider stock
Step 2: The Breakdown
Take all attachments off the Retaliator.
Step 3: Attachmentz
Simply put the replacement barrel and stock on.
Step 4: Done...
You're done! Hooray! Congratulations! Enjoy!