Hmm, so...no one, maybe one, has actual experience with both the HW100 AND...the HW110 ?
I can't answer the question either as I only have experience with the HW100 (bullpup). Great design, especially for the Bullpup mechanism.
And sort of contrary to one answer above, the barrel in the HW100 is only held in with "one" set screw, not multiple as the poster sort of comments on (the letter s = multiple !). And it secures the barrel from an angle, so it pushes the barrel very solidly "into" the receiver. No amount of force, or twist will pull it out.
And for what it may be worth, the socket of the HW100's receiver, accepts the barrel inserting into the receiver much more "accurately" than normal threading, I'd rather have a nice snug slip fit to a thread securing my barrel. Which, yes, the HW100 does have, the HW110 is threaded.
Mike