And here is a sampling of other excellent slingbow tutorials

And here is a sampling of other relevant tutorials

ArrowGun is a simple DIY project that integrates archery and munitions

The result is a game-changing armament that helps implement

Did David ask Goliath for permission to own a slingshot?

Summary of the invention
 

Legal Disclaimer

The "ArrowGun" is comprised of a user-supplied bullet (or shotgun shell) housed inside of a specially-configured adapter that affixes the bullet to the end of a user-supplied and user-modified arrow.  The modified arrow is launched towards its target using a conventional, user-supplied archery bow.  The bullet-affixing adapter is comprised of a robust cup into which the bullet or shotgun shell is secured.  The bottom of the cup receives the bullet's primer-end that it reliably explodes on contact with the target. yada yada yada... 

An "ArrowGun" conversion kit is comprised of just two components that form a kit that facilitate the conversion of a standard archery arrow into a launchable, interially-triggered firearm.  the user yada yada yada... 

ArrowGun's game-changing feature is its inertial firing pin

An ArrowGun can be launched from any archery bow.  It also flies perfectly from a "slingshot bow"

This CAD example shows a standard archery arrow and shotgun shell that have been converted into an ArrowGun 

Here you see the internal structure of the modified arrow shaft.  The firing pin slides freely inside the tube.  A composite carbon fiber and aluminum shell-holder completes the conversion.

When the ArrowGun is launched, the firing pin's inertia forces it against the shaft's internal rear stop.  When the shell-holder strikes its target, the pin's momentum forces it to snap forward and detonate the shell's primer. 

Launching from a crossbow gives it even greater range and accuracy

For optimal versatility, it can even be affixed to an FPV drone

Below are some relevant videos

Here's a (failed) attempt at archery-based ordnance

Here's a rediscovered archery technique

Here's one low-cost DIY slingbow

Here's a pair of powerful DIY AirBow launchers

Here is some relevant drone-launching information

And here's a trip down memory lane

Every earthling has the inalienable right to self-defense

Every citizen of this planet has the inalienable right to self-defense

See how it works

Oh... and here's another innovative tool for freedom-lovers