I've three STO Falix, medium flow, 1 on a Gladius .177, SK19 in .22 and a K1 in.25, my go to moderators. I think you'll be happy with them. I'm setting up a K1 in .177 bought a Huma 40 from Trenier to try. I would like to try STO Sarissa, You'll be pleased with it, no appreciable change of POI, solid construction and good looking. Function over form, can't stand those designer moderators with swirls and such.