Now that the Heckler & Koch VP9 is represented in the T4E line of magazine fed paint, rubber, and dust ball markers, you will need extra magazines to fully maximize your experience with this superb training and paintball tool. This magazine features T4E's Quick Piercing CO2 piercing system. This allows you to instantly engage the fresh magazine when ready. Like other magazines in the T4E handgun marker line, the HK VP9 holds 8 rounds of .43 caliber paint, dust, or rubber rounds.