After I started making my grips, I felt like I had much better control of the pistol, but still I wasn't really closing the gap between the web of my thumb and the tang of the pistol. That's why I invented the Thumby for select models: - Canik -- Canik Steel Frame SFx RIVAL-S -- Canik Poly Frame SFx RIVAL or TTI Combat or METE SFT -- Canik METE MC9 or TP9 Elite SC -- Canik METE MC9L or METE MC9LS or METE MC9 PRIME - Walther -- Walther Steel Frame - PDP or Q5 or Q4 - CZ -- CZ 75 P-01 or SP-01 or Shadow 2