Variant model of the IMP 1841/25J. Where as the basic IMP 1841 series units are melee wielding "sprite" class drones, the IMP T1426 series feature integrated fire arms.
Both retain the same level of agility and are as adept dancing across a battlefield as each other. Low in body armour, they use their speed and agility to avoid enemy fire. They operate on the premiss that a moving target is harder to hit, and they are normally right.
Just like the IMP 1841 series it is not impossible to see these sneaking up behind enemy mechs and decapitating their AI modules with a well placed slice from their duranium alloy blades.