Brass Shot Gun Snap Caps 12G, 20G, .410 Brass Shot Gun Snap Caps 12G, 20G, .410 Brass Shot Gun Snap Caps 12G, 20G, .410 (9 ratings) Snap Caps, shotgun £16.95 Gauge Size: [Choose]12 Gauge20 Gauge-410 Gauge Quantity: at £16.95 each Add To Basket 5 in stock.