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Actually it looks like a "Classic" host. Like this: Link.
Which means the top part can be twisted to put the lens further from the body.
Usually these are preset to be at infinity when screwed all the way in. If not, you can take off the top and adjust the lens a bit.
You can adjust the lens in the top portion which twists off, if you want to...
But don't touch the other lenses, in the body of the laser.