The box magazine in his right hand is a giveaway. Distinct flash hider too.The guy on the right in the cold room pictures is holding an M-14.
There are more photos of this , this was a long term storage packaging. There are also packaged in drums for extreme testing. I'll get more later.I'm wondering about the series of photos with the prominently displayed clock. Clearly the series is illustrating how the rifles were dipped in cosmoline and boxed for shipping, but the final photo with the disassembled rifle and the clock at 10:20 is a bit puzzling. I wonder if it is intended to illustrate how the cosmoline seeps into every nook and crevice, or is it intended to illustrate the cleaning of the cosmoline by the soldier to whom it is issued? It appears the cosmoline is partially cleaned from the stock so it's not clear to me what this particular photo is intended to show.
Looking at the later photos from the 1963 rebuild program makes one appreciate the advances in chemicals technology and their application to protective packaging which eliminated the use of cosmoline and resulted in a rifle that can be removed from protective packaging and virtually immediately put to use.
He's also smaller than the guy carrying the M1. RNGR1The box magazine in his right hand is a giveaway. Distinct flash hider too.