i got the HW100 Tuning titanium cylinder, OEM ends fitted, when I sent the rifle to them for a service and upgrade. Getting about 100 shots from a 200 bar fill for a .20 KT FSB. Got the larger capacity cylinder fitted but it's lighter than the original and, as said, it does improve the handling by moving the balance point rearwards.I’ve got a HW100 tuning titanium cylinder on mine, used the original ends. Some said it wasn’t worth the weight saving but I’d disagree, it’s noticeable and definitely moves the balance point back, which I prefer.
Unless you’re range shooting or on huge numbers of rats the shot count ought to be OK, I get about 60 in .20 calibre. If you are range/bench shooting then there are better tools for the job anyway.