HandFrag is a 
Daedalus SMG
Its special effect is Deep Pockets - On Reload, fire a Shotgun Blast that scales with the amount of Ammo reloaded.
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How to Unlock The Legendary Hand Frag Daedalus SMG
Weapons
Legendary Loot
Overview
How To Unlock
Unlock Location:
- Progress through the (FL4k And The Last Resort) DLC until reaching the Boss
RelaxMech
Farm Method:
- Defeat RelaxMech to get a chance at the HandFrag.
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat RelaxMech until the HandFrag drops.