GURPS Homebrew: Binary Trigger Pack

 

GURPS Homebrew: Binary Trigger Pack Gunsmithing Option

We all watched the movies or played the games where a brave commando fires his gun full auto, destroying his enemies in droves as an inspirational battle track plays in the background. That's how many people got into guns as a hobby, even. Similar to how many car enthusiasts started enjoying cars after seeing an F1 grand prix.

And while car owners can still head over to the racing track with their street cars and break a few limits while drifting a few corners, civilian gun owners are forbidden by law to own a weapon capable of automatic fire, sans some exceptions. And so, weapon engineers set out to find a loophole in the law and assemble a legal device that would give a civilian firearm a semblence of automatic fire. 

And the loophole was, your firearm must fire only once per trigger pull. But trigger release is not mentioned.

Binary Trigger Pack (TL8)

$400, neg, LC3

This device replaces standard safe-semi trigger and fire control group with safe-semi-binary. While the weapon functions as normal in safe-semi modes, the new binary mode functions unlike any other firearm. In binary mode, when you pull the trigger, a bullet is fired. Then, when you release the trigger, another bullet is fired. Effectively, a weapon fires twice per trigger pull! Treat it as 2-round Limited Burst (HT83). Due to the system's unique behavior, those unfamiliar with a firearm that has it suffer an extra -2 familiarity penalty (-4 total) to Guns skill. The second shot's discharge can be canceled by moving safety selector to semi or safe while the trigger is held down (Ready maneuver or free with Lightning Fingers).

These devices only work with semiautomatic weapons, and each one is designed for specific system (AR15, Glock, H&K G3 etc), but designs are available for virtually all popular semi-automatic firearms, including rifles, pistol caliber carbines (civilian SMGs), semiautomatic shotguns and pistols as well. Installation is treated as Adding Accessories (TS68) and is a Complicated process. The weapon's ROF changes to 6 and it operates as if it has 2-shot Limited Burst (HT83).

This design originates in the USA and in majority of states it is an LC3 device, although some states have moved to independently ban it, making a firearm with binary trigger an LC2 weapon. Outside of the US, such designs are rare and most jurisdictions do not include the same loophole as US gun laws, making the item itself LC2. Despite that, due to design's novelty, one can still try to import and install it, since laws seldom have provisions to forbid it. A good lawyer is recommended still.

In situations where law is of no concern, such device could be part of a unique weapon, or used by folks who need firepower, but are unable to acquire actual automatics. It is also much safer to install on a firearm than trying to convert it to full-auto via homemade measures, and limited RoF ensures the gun doesn't beat itself to death.