Suppressed WW2 Firearms

[imntxs554]

I was searching for Suppressed WW2 Military Firearms and I came across these Bolt Actions which look like the same and a Semi-Auto one. I did see British on one and Springfield Armory on the other. I do see 2 different types of magazines. Why would there be a Bolt Action while the Carbine was already a proven Semi-auto and not just go with it ? Just Curious as I love to see anything interesting used in WW2. The 4th Picture looks different than the others to me and didn't see anything about it.

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