It works like a champ. I had to remove a small amount of the plastic shroud near the end of the barrel for the added length of the HW100 cylinder and grind down the bottom side of the moderator adapter slightly to clear the gauge. Shot count went from mid 20's to 40 shots (.177). I also added a homemade moderator. It's obviously not as quite as the Weihrauch but actually still pretty quite to my ears and 3.25" shorter.
I purchased a HW100 bullpup a while back and added a longer Ratworks aluminun cylinder so I already had the cylinder, so I had no expense for this mod. I couldn't be happier with the outcome.
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