First time I ever used laser grips . They came with a carry pistol , A Colt New Agent in 45acp , I found them a pleasure to shoot with . I just ordered a second pair to install on my Colt 70 Series MK lV 45 ACP Government , when shooting at a set distance and adjusting the laser to shoot in line with your sights , you can tell all your faults . Makes for a great aid , would highly recommend them for new shooters .