What you really want to do, friend, is get yourself a MANUAL for your rifle, then read it completely and carefully and learn what makes the thing work..... and how... and why.
Zip over to milsurps dot com and take out a (free) membership. They have a section of WW2 US training films which cover just about anything that was on the go back then. They also have a FANTASTIC free library of Manuals, Films, research papers, marksmanship textbooks (the very best is called SHOOT TO LIVE! and it is the Canadian WW2 marksmanship manual which was so good it was still in use 30 years after the war) all available for free download.
If you can't find an English-language manual for your rifle, download a manual for the FN-FAL or the British L1A1 or for the SAFN-49. The rifles LOOK very different, but their design, operation and cycling is nearly identical. The Tokarev bolt system actually was lifted from the 1936 Saive patent drawings.
Hope this helps.
Good luck!
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