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Better image, which shows the stock unfolded and the bayonet affixed.
Yes, another feature of the M56 is its bayonet lug, and it had its very own little bayonet. The bolt can be locked in the rear or forward position by manipulating the tab on the charging handle, as well, which echoes the Russian PPSh-41 a little, locking it forward would be the safe way to carry it loaded.
I believe also that the grooves around the front and rear of the bolt may have been intended to catch accumulating dirt, a bit like the laterally ridged receiver on the German MP38, or the spiral grooves around the bolt on the British L2A1 Sterling, how well that actually worked I can't speak for.
I've been working away on the assets for 94 Protons Of /vr/ in all this time, too, it's just that a bunch of stupid shit happened in sequence just recently, so I had to focus on other things. I'm nothing if not slow.