Well I finally got my FAC XL light weight cylinder from Rat Works UK for my HW100 KT , great quality with no leaks plus It makes the gun look more proportionate . But I'm a little disappointed I thought I might double my shot count from two mags ( 28 shots ) to four mags but I'm only just getting three mags before It starts to fall of the reg . The description on their web site says you can only fill to 200 bar because that's what the reg Is set up for I'm tempted to fill It to 225 then maybe Ill get the four mags .