I use them in both K80 and KX5. I do not notice a weight change. I use Ti chokes because they are less likely to rust or become stuck. Also look better. Can tighten with fingers if necessary. More expensive. All the same reasons I shoot K guns.
CharlesR1100, I wouldn't bet on that "less likely to become stuck comment." The galvanic corrosion that can occur when you screw a nonferrous and a ferrous metal together can lock the two together pretty tight. Especially so with titanium and steel. If you don't remove them frequently I'd suggest a coating of anti-seize the entire length of the tube.
Griffonexpress, I’d buy em’ just because they look so cool. Krieghoff offers a titanium front barrel hanger too, nice... But again pricy. cls