This is a Lyman Snap Caps, model 15315.
For safety training" function testing or safely decocking without damaging the firing pin" A-Zoom training rounds are much more than conventional snap-caps. They are precision CNC machined from solid aluminum to precise cartridge dimensions" then hard anodized for ultra-smooth functioning and long life.
Features:
Solid Aluminum
Hard Anodized
Smooth Functioning
Precise Cartridge Dimensions