Is it even possible to mount a 3 lug adapter to a 45 barrel?
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I've never seen one.
That 5/8 adapter was probably so you could run your 3 lug 9mm can on a 300blk. 45 is normally .578-28 tpi.
I saw a different 45 caliber done in 5/8x24, While I assume the 58 adapter is for 300blk, I wonder if the internal diameter is enough for a 45 to pass through.
Looking at this picture I'm going to guess no. Looks too small to me.