) I am very satisfied with this product (ITW BRANDS 40066 .22 Caliber Trigger Shot Tool) after a project nailed 30+ 2"x4" bolts to a Cement block wall No problem. I used ITW .22 gauge yellow weights and ITW .300 2-1/2" (nails) drive pins. No misfire. For the $, it's a good buy and easy to use. Wear earmuffs, eye protection, and gloves I didn't wear gloves and in tight corners or near obstacles the power of the tool can hit my knuckles pretty good!