I've got a cheap BSA 30 from Wally World on a 22/45, MK III, that works great. It may eat batteries more than some other units but it works fine for me at the ranges I shoot a pistol, which are generally short. I know there are better, lighter, red dots, but I didn't want to spend a lot of money on one at first. So far the BSA has worked out well. I've even used it to kill a couple of squirrels with the 22/45.