Attack Attribute - Close Combat.
A Charging model part with Fire on Impact! using a Pistol, a Brace of Pistols, or a Repeater Pistol always strikes at Initiative Step 10, and has the Strength of its Close Combat Attacks set to 4 and their Armour Penetration set to 2 (regardless of the user's Agility, Strength, and Armour Penetration).