A-Zoom Centerfire Pistol Snap Caps .40 SW 10 Pack Blue. Like all snap caps you can chamber the A Zoom round and practice dry-fire training without damaging your firing pin. The additional engineering allows you to load them into magazines knowing they'll properly feed when you're working the slide. This allows for realistic practice chambering rounds dry-firing and performing multiple quick magazine swaps. The blue coloring allows instant recognition of the snap cap when you do press checks too. Many users like to store their pistols with one in the chamber to preserve the firing pin spring. They're available in the most popular calibers: .380 ACP 9mm .40 S&W .45 ACP and 9mm snap caps. Each Value Pack contains ten snap caps. Specifications for A-Zoom Blue Centerfire Pistol Value Packs: Manufacturer: A-Zoom Fabric/Material: Solid Aluminum Number of Rounds: 10 Gun Type: Pistol Color: Blue Features of A-Zoom Blue Centerfire Pistol Snap Caps: Hard-anodized aluminum Exact pistol cartridge dimensions Package Contents: A-Zoom Blue Centerfire Pistol Snap Caps (x10) A-Zoom 15314: Centerfire Pistol Snap Caps .40 SW 10-Pack Blue