Kig-Yar point defense gauntlet

Jackal Point Defense Gauntlets are linear energy sheilds mainly used by the Covenant Jackals for protection from enemy fire. Worn on the forearm, they create a barrier that can deflect most solid projectile weapon.

Damage Resistance
The shield of the point defense gauntlet reflects its current charge by changing color gradually from its original color to red before it deactivates completely.

In Halo 2, the shield appears to have been weakened. It is now possible, but difficult, to bring down a shield with projectile weaponry, and a sniper round to the central dot will collapse it and stun the Jackal.

Halo 3 era jackal shields are identical to the ones in Halo 2.

UNSC Weapons
The Jackal Point Defense Gauntlet is completely resistant to the UNSC's metallic projectile ammunition. Most UNSC weaponry will simply bounce off the shields. Even the SRS99C-S2 AM Sniper Rifle's large 14.5mm APFSDS are deflected (except when fired at the central shield emitter).

However continuous fire from certain weapons will cause the Jackal to momentarily drop its shield. The Warthog's M41 LAAG, AIE-486H Heavy Machine Gun and curiously the MA5B and SMG, rounds will cause the Jackal to flinch allowing the rest of the weapon's bullets to eliminate the Jackal. This may be due to the physical weakness of the Jackal as the bullets themselves are deflected.

The few human weapons that can penetrate the shield are explosive weapons such as the Rocket Launcher, missile pod, and the Spartan Laser.

Covenant Weapons
Covenant Plasma-based weaponry on the other hand, depletes the Energy Shield until they completely collapse. For example, a few shots from a Plasma Rifle or a Plasma Pistol overcharged shot will successfully collapse the shield and may also cause the jackal to flee.

Strangely, the Covenant Carbine, a projectile weapon, can also deplete the shield.

Grenades
Explosions from Grenades can collapse the shield and kill the jackal. It should be noted that the Plasma Grenade and the Spike Grenade will not stick to shield but can still destroy the shield and the jackal if its near the explosion.

Melee
At close quarters thhe most effective and efficient way to kill a Jackal is with a melee attack. A direct hit to the shield will often knock it backwards into the Jackal, sending a power surge through the Jackal's body and killing it. However, on Heroic and Legendary, it will often take more than one attack. Similar to most enemies, Jackals flinch when hit with a melee attack. In Halo 2 however, the shield now provides the Jackals with limited melee protection.

Trivia

 * In the first Teaser of Halo: Combat Evolved a group of UNSC Marines inside a Forerunner complex engage with a Major Domo Elite with a triple-layered personal arm shield similar to the Jackal's.
 * In Halo 2, the Arbiter's zoom outline resembles that of a horizontal Jackal Energy Shield from Halo 1.
 * Sniper Jackals wear point defense gauntlets but never use them, even after dropping their rifles or carbines and fleeing.

Related Links

 * Energy Shields
 * Overshield
 * Elite Personal Energy Shield
 * Jackals
 * Shielded Flood Carriers