That scene actually was from "The Longest Day". Be aware that it is never a good idea with any semiauto (long gun or handgun) to just let the op rod or slide slam forward when the magazine is empty, due to abnormally heavier wear on the parts. This is because the piece is designed to move forward at the speed it moves at while stripping and chambering a round; if no round is to be chambered, hold back the slide or op rod and assist it gently forward. With the Garand, I hold the op rod with my right hand and assist it forward after gingerly depressing the follower a little with my left hand, while the rifle is sitting on a bench or table. I wouldn't mind the pain as much as all the blood and gore rusting out the chamber! Just my opinion, since I have so far avoided M1 Thumb.
Happy Trails, especially for the CPC on Jan. 23.