LG-307 laser sights for Smith & Wesson K & L-Frame revolvers feature a comfortable rubber overmold grip that provides ideal comfort and security for large caliber revolvers. The laser activation switch is located in the front of the revolver's Lasergrips, making activation "instinctive" when you assume a normal firing grip on the revolver. Lasergrips fit Smith & Wesson Models 10 Through 19,48,53,56,64 Through 68,242,296,386,396,547,581,586,617,647,648,686 and 696.