You can make "SIL hybrid bow" yourself and at your own risk.
This device is not a toy, it can be very dangerous (can be deadly), so be careful and hide it from children. Do not shoot living beings, use an good quality archery mat/backstop!
It took a lot of work, money, time and thought to prepare this complete project, so it will not be released for free. Sorry.
You can download STL files for a relatively small fee. Links below.
Below are links to the files needed to make a SIL hybrid bow and SIL Ammo Clip: