Any competitor serious about his shooting is aware of the importance of chamber checking ammo before a match. Since most malfunctions are ammo related, and most of those relate to deformed, bulging or otherwise defective brass - dropping the ammo into a gauge is an effective way to reduce the chance of a costly malfunction. The problem has always been that it takes time! Over 15 minutes at least, to test 400 rounds with a single bullet gauge or using one's barrel. Well not any more! We are pleased to offer the DAA Golden 20-Pocket Gauges, available in 9mm or .40 S&W. These gauges are machined from top quality aluminum, and the pockets are finished using Clymer finishing reamers which are the same used by top gunsmiths worldwide to cut the final dimensions on the barrel. The twenty pockets allow you to drop in rounds much faster than possible with a single gauge, cutting your testing time down to less than half. A great deal of thought went into the dimensions of the block: The bullet pockets were positioned as tightly together as possible, in order to allow dropping 2 or 3 bullets in at a time, in the same way you would fill your ammo boxes. The height is purposely cut shorter than other gauges, so that the tip of the bullet head sticks out. If a bullet gets stuck, as reloaded ammo often does - you can simply push it loose from below with your finger, without having to pick up a tool. A must have for the reloading bench. Available in 9mm and .40.