Original sentence: Massachusetts main battery consisted of nine 16 in (406 mm) 45 caliber Mark 6 guns in three triple turrets - two in a superfiring pair forward, the third turret mounted aft of the main superstructure- that were capable of firing 2,700 pounds (1,225 kilograms) armor-piercing (AP) Mark 8 shells
Edited sentence: Massachusetts main battery consisted of nine 16 in (406 mm) 45 caliber Mark 6 guns in three triple turrets (two in a superfiring pair forward, the third turret mounted aft of the main superstructure) that were capable of firing 2,700 pounds (1,225 kilograms) armor-piercing (AP) Mark 8 shells