Never heard of any restrictor plate on the box that needs drilling out. I've heard of it on the pump? ![Think... :think:](https://board.marlincrawler.com/Smileys/marlin/think.gif)
Well there you have it.for some reason when I was gathering parts to do assist, I thought I read about one on the box.i went full hydro because I kept cracking the frame.anyways, I have this box all freshly rebuilt and painted if ya want it.