The AT Block The new standard of safety and dry-fire Created by a weapons and tactics instructor, the AT Block turns a regular handgun into a dry-fire training tool in seconds. Dry fire training and drills can dramatically increase proficiency, improve muscle memory, and enable shooters to practice drawing from a holster, multiple target transitions, moving while shooting, and more. Safety: Ensures that the barrel is unobstructed. Turns a live weapon into a safe dry-fire tool. Brightly-colored to make it easier to identify the firearm as safe. Time Saving: Fast insertion and extraction directly through the chamber without the need to disassemble and reassemble the gun. Adjustable: Can be trimmed and customized to suit various carry methods and holster styles. Can fit 9mm and 45 ACP handguns.