Original sentence: The W9 was a gun-type nuclear weapon, utilizing around 50 kilograms of highly enriched uranium in one large rings assembly and one smaller "bullet", which was fired down a tube by conventional explosives into the rings assembly to achieve critical mass and detonate the weapon
Edited sentence: The W9 was a gun-type nuclear weapon, utilising around 50 kilograms of highly enriched uranium in one large rings assembly and one smaller "bullet", which was fired down a tube by conventional explosives into the rings assembly to achieve critical mass and detonate the weapon