Step 1. Acquire a bow and arrow set or a crossbow for a $50 discount on Amazon
Step 2. Buy a powerhead adapter and a appropriate head from billsbangsticks.com
Step 3. Go to your local Walmart and acquire the compatible cartridge like a 12-gauge shotgun shell.
Step 4. Assemble the powerhead attachment and attach your 1 1/4″ to 5/16ths” adapter to your arrow
Warning: This attachment adds significant weight in grains and Forward-of-Center your projectile, which greatly limits your effective range. I wouldnt recommend using it any father than 40 yards.