The 
Laser Gatling turns the Ancient Factory‘s own weaponry against your enemies. It fires the same rapid laser beams that the Harbinger and its robotic guardians use, letting you shred targets from across the battlefield. Every pull unleashes a continuous stream of energy that burns through mobs and sets them alight.
Best of all, it runs on 
Redstone instead of 
Arrows, so ammunition is cheap and easy to stockpile. The weapon never wears out, and a single piece of Redstone is good for nearly fifty beams.
Obtaining
You craft the Laser Gatling at a normal 
Crafting Table, so no special station is required. The recipe combines three 
Iron Ingots, Redstone, a 
Redstone Block, and two 
Witherite Ingots.
Witherite Ingots are the gating ingredient here. You earn them by defeating the Harbinger, the boss of the Ancient Factory. The Harbinger drops a 
Witherite Block that you craft into nine Witherite Ingots, which places the Laser Gatling firmly in the late game. Everything else is basic Redstone and Iron you most likely already have on hand.
Usage
Hold right-click to fire. The weapon pours out roughly ten laser beams every second, and each beam deals 7 damage. Landing a full stream is close to seventy damage a second, enough to melt most mobs in moments.
Every beam also sets its target on fire for five seconds, so damage keeps ticking even after you stop shooting. The beams travel quickly and pick up speed as they fly, giving the weapon excellent reach against distant or airborne enemies.
The Laser Gatling cannot be enchanted. There is no benefit in taking it to an enchanting table, so save your Lapis and XP for your armor and melee weapons instead.
Carry Redstone as Ammo
Keep Redstone Dust in your inventory
Keep some Redstone Dust anywhere in your inventory before you fight. The Gatling draws from it on its own, so you never have to load it by hand.
Hold to Fire
A rapid laser stream
Aim and hold right-click to unleash a steady stream of beams. A full charge lasts about five seconds of continuous fire, which works out to nearly fifty shots.
Automatic Reload
One Redstone per refill
When the charge runs dry, the Gatling reloads itself from your Redstone after a brief pause. Each reload costs a single Redstone Dust and fills the weapon back to full. It never truly breaks, and its durability bar is really just a charge meter.
The beams ignite flammable blocks they strike and leave small fires where they land. Avoid firing near your wooden builds, farms, and storage, and take extra care in dry biomes.
FAQ
It uses plain Redstone Dust. A single Redstone reloads the weapon fully and is good for nearly fifty beams, so a small stack lasts a long time.
You do not reload it manually. As long as you carry Redstone Dust, the Gatling refills itself automatically after the charge runs out, pausing briefly before it can fire again.
Each beam deals 7 damage, and it fires about ten beams a second. A sustained stream reaches close to seventy damage per second, and every hit also sets the target on fire for five extra seconds.
There is no anvil repair, and none is needed. The durability bar acts as a charge meter that you top up with Redstone, so the weapon never permanently breaks.
No. The Laser Gatling cannot be enchanted. If you want an enchantable weapon from the same Harbinger loot, craft the Meat Shredder instead. It accepts weapon enchantments and covers close-range combat where the Gatling is weaker anyway.
