Plastic Shot Gun Snap Caps 12G, 20G, .410 Plastic Shot Gun Snap Caps 12G, 20G, .410 Plastic Shot Gun Snap Caps 12G, 20G, .410 (9 ratings) Shotgun snap caps, for protection £6.95 Gauge Size: [Choose]12 Gauge20 Gauge-410 Gauge Quantity: at £6.95 each Add To Basket 15 in stock.