The GRP (Gravity Restraint Projector) is a Auxiliary Ranged weapon in the Callisto Protocol. Read on to learn more about the GRP including how to get this weapon, its exact recharge rate and time, a complete list of all upgrades, as well as how to use it effectively.

GRP General Info

GRP
A miniaturized graviton field generator used by UJC Correctional Officers to pacify inmates and manipulate objects.
Type	Auxiliary Ranged
Acquisition Type	Story Progression

What is the GRP Recharge Rate and Time?

3 Minutes to Reach Full Charge

Unless you have a GRP Battery in your inventory, it will take 3 minutes for a fully depleted GRP to recharge and become usable again. While empty, you will not be able to pick up or throw anything using the GRP.

Only Starts Recharging Once You Stop Using the GRP

Do note that the energy recharge of the GRP will only start after you stop using it. If you keep trying to use it even on low charge, it will not start charging.

To confirm whether your GRP has run out of juice or not, simply view the blue rectangle above your HP bar. If it is a hollow blue rectangle, then that means your GRP has no energy left. If it has energy but flashes red when you use it, that means it does not have enough energy to perform that action.

Recharge Rate is Not Affected by Energy Capacity

The GRP's recharge rate, as well as any of its related upgrades, will not be affected by the Energy Capacity. No matter how many Energy Capacity upgrades you give to the GRP, the recharge time will always remain constant as seen above.

All GRP Upgrades

Recharge Rate Upgrades

Energy Capacity Upgrades

Launch Strength Upgrades

How to Get the GRP

Can be Found on a Dismembered Arm in the Medical Bay

During the Aftermath story chapter, Elias will at one point ask you to head to the Medical Bay. When you first enter this new area, Jacob will interact with the dismembered arm of a dead guard, looting and equipping the GRP in the process.

Aftermath Walkthrough and Implant Bio Locations

How to Use the GRP

Used to Grip & Throw Enemies Used to Interact with Hazards Used to Grip & Throw Objects Recharges Automatically or via Battery

Used to Grip & Throw Enemies

Players can use the GRP to grip and throw enemies around. The distance and damage received on impact will depend on your weapon upgrades and the size of the enemy. Larger enemies will be more difficult to throw while also requiring more energy to grip.

Used to Interact with Environment Hazards

The GRP can also be used for quick and easy kills via environmental hazards. Simply use the GRP and grip and enemy, before launching them at a hazard for an insta-kill. This is particularly useful on higher difficulties where melee combat is much more deadly.

Used to Grip & Throw Objects

Lastly, the GRP can be used to grip and throw objects. At higher upgrade levels, this will become much more deadly. However, when you first get the GRP, its object throw will simply induce a mini-stagger until upgraded.

Recharges Automatically or via Battery

To see how much charge is left on your GRP, hold down the aim button (RMB on PC) and check the blue bar on top of your HP bar. When not aiming, the small blue light will start flashing when you're low on GRP energy.

The GRP will recharge itself automatically but it can take quite a bit of time. To speed things up, especially during stages with multiple enemies, pick up a GRP Battery. This item automatically charges your GRP as soon as it runs out of energy.

The Callisto Protocol Related Guides

List of Weapons

All Melee Weapons

Melee Weapons
Shiv	Crowbar	Stun Baton

All Ranged Weapons

Ranged Weapons
Hand Cannon	GRP	Skunk Gun
Riot Gun	Tactical Pistol	Assault Rifle