Remember the Iron Man-style jet suit created by British inventor Richard Browning that allowed him to fly through the air like Tony Stark?
Now another British inventor has created an accessory for the suit, which casts it in a rather more sinister light.
The accessory is a shoulder-mounted Airsoft rifle that tracks the movement of the wearer's head, allowing him to shoot at targets just by looking at them.
Mechanical engineer James Bruton from Winchester shared the process of creating and testing the gun mount in a video on YouTube.
"The jet suit guys from Gravity asked me if I could build a shoulder-mounted head-tracking gun turret, so they could have some fun flying around shooting," he said.
The video also shows Browning, founder of Gravity Industries, testing it out with his jet suit in a "top secret" location.
The contraption consists of a one-axis turret and a heavy duty actuator, with the Airsoft rifle mounted on top.
A sensor in Browning's helmet tells the gun which way to point, and he has a trigger in the left arm assembly, allowing him to fire at targets.
After the flight, Browning said he could feel the suit shudder as the BB gun unleashed a hail of pellets.
"I tell you what, it feels amazing," he said. "You can feel the whole suit shake."
While Browning does have a military background - he was in the Royal Marines Reserve - the shoulder-mounted gun is not intended to be used in real combat situations.
Browning told Mirror Online that it was intended as a bit of fun, and to "make Airsoft airborne".
Gravity Industries has been developing the "multi-gas turbine engine Jet Suit" since 2017, and was awarded a patent for the invention earlier this year.
The suit, which weighs around 25kg, consists of a specially designed exoskeleton, four arm-mounted gas turbine engines and two hip-mounted gas turbine engines.
These allow the pilot to take off vertically and fly use his own body as the thrust control, provided he is capable of holding his body weight for long periods of time.
The suit's five gas turbines - which are not dissimilar to those found on a jet fighter - are capable of propelling the wearer through the air at speeds of up to 55 mph.
Gravity is also working on a "wing" attachment for the suit, which will allow the pilot to manoeuvre into a more horizontal position.
This essentially turns them into a "baby jet fighter", according to Browning,allowing them to reach speeds of up to 70 mph.
The company, which already holds the Guinness World Record for fastest speed in a body-controlled jet engine power suit, hopes the wing will help it beat its own record.
More details and videos of can be found on Gravity's Instagram page.