The IPCA Stun Gun is a taser on the Survival Wheel. You earn it by collecting all 18 pieces of IPCA Tech. It stuns Freakers and sometimes sets them on fire, but both prongs have to hit.
There's Nothing You Can DoThe secret ending. After the credits, O'Brian gets in touch and asks to meet you in person at a NERO landing zone by the Pioneer Cemetery. You ride out to hear what he has to say.Use it to stun a single Freaker or human, then finish them with melee. It is not efficient enough for crowds.
Get close enough that both prongs land, or the shot does nothing. Treat it as a novelty reward for completionists.
Crossbow
The Crossbow is an Average-condition special weapon for silent kills. It reloads slowly, but bolts make no noise. It gets more useful as you unlock more bolt recipes.
Drifter Crossbow
The Drifter Crossbow is the Military Spec upgrade to the standard crossbow. It is still silent, and it fires every bolt type: standard, Residue, Incendiary, Poison and Explosive. It is the best special weapon for stealth.
Proximity Bomb
The Proximity Bomb is a crafted trap that goes off when enemies get close. Its recipe sits in the Berley Lake Ambush Camp bunker. Place them in a Horde's path or at a door you expect enemies to use.
Proximity Mine
The Proximity Mine is a military-grade mine that goes off when enemies come near. It does the same job as the crafted Proximity Bomb. Use it to set up an ambush or cover a Horde's route.