Given the task definition and input, reply with output. Given a passage as input, answer with the category to which the passage belongs. There are 5 categories - Sports and Fitness, Home and Garden, Hobbies and Crafts, Food and Entertaining, Cars & Other Vehicles. The answer should be one of the categories based on words from the passage which closely belong to the category.

Choose the type of steel to be used for the gun barrel. Cut a piece of steel for the barrel stock. Drill down the interior lengthwise to a diameter about 5 thousandths of an inch (0.127 mm) less than the desired finished bore diameter of the barrel.Work a tungsten carbide bore reamer down the finished drill hole of the barrel, using liquid coolant as the reamer works.Rifling consists of spiral grooves in the bore, which will impart a spin to the fired round as it travels down the barrel. Lap the barrel to fine polish the bore.

Sports and Fitness