Grip
The default pistol form. Reliable, accurate at medium range, and has a decent rate of fire. Good for general combat and headshots. Excellent for conserving other forms' cooldowns.

Spin
A rapid-fire SMG-like form. Devastating at close range but less accurate at a distance. Ideal for quickly shredding unarmored enemies or dealing burst damage to larger targets. Consumes ammo quickly.
Pierce
A powerful, slow-firing sniper-like form. Penetrates multiple enemies and deals high damage. Perfect for armored Hiss or taking out enemies from afar. Requires precise aiming.
Shatter
A shotgun-like form. Extremely powerful at very close range, capable of one-shotting weaker Hiss. Great for crowd control and enemies that rush you. Has a wide spread.
Charge
A grenade launcher-like form. Fires explosive projectiles that deal area-of-effect damage. Excellent for groups of enemies or hitting targets behind cover. Has a slow fire rate and projectile speed.
Compare service weapon forms: details & usage inControl Ultimate Edition