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!
This project is based on the invention of Jörg Sprave from The Slingshot Channel named "Sliding Instant Legolas", commercially available under the name "The Fenris".
I put his name on the back part of the magazine with his permission, to appreciate this great invention.
As "The Fenris" is CNC machined in Austria and very expensive, I decided to make my own cheaper DIY version. I present my vision of Jörg's invention, with some of my proprietary solutions, optimized to be made with 3D printed parts and other easily available materials.
SIL hybrid was designed to the EK Archery Assassin / Exterminator compound bow only, but after designing a dedicated adapter, it can also be mounted on other compound bows.
You can see how it works.
This is a DIY development project, so there will also be adapters for other bows in the future.
You can find the current list of compatible bows and available adapters here.
Before you start building, make sure that this type of weapon is legal in your country.
I am not responsible for the consequences of building, possession and using this repeating bow.
You build it on your own responsibility.
SIL hybrid is pump-action repeating bow with integrated quiver (magazine) for 7 arrows (bolts) and thumb triggered release. Standard 15 inch long bolts (carbon bolts for EK Archery Cobra R9 / Cold Steel Cheap Shot 130 crossbows) can be loaded manually or automatically with additional SIL Ammo Clip, after deflecting the magazine spring lever. Aiming is carried out using a laser sight (up to 15-20 m distance) or red dot sight (up to 30-40 m distance). Possible installation of a short 4x32 ACOG type scope and shooting at longer distances. The magazine is easy to assemble and disassemble on the bow, because the rear handle is tilted away after unscrewing one thumb screw.
The magazine during transport can be also mounted direct to the EK Archery Assassin / Exterminator bow using special screws for the quiver mounting locations. For German users there is also a dedicated adjustable adapter for the standard round 15x68 mm laser available. If you don't like the finger draw holder, you can mount a special draw limiter instead (it is also recommended for very fast shooting).
SIL magazine is a hybrid of 4 aluminum profiles (20x10x2 mm angles 700 mm long - from a DIY store) and a dozen or so printed parts on a 3D printer. The aluminum profiles ensure rigidity, while the 3D printed elements merge everything into one with M3 screws. As you can see in the pictures, the construction is quite simple. I used cheap rollers and thumb screws from the 3D printer and some different screws, nuts and springs. The cost of materials is around 40-50 euros. The most difficult is to drill so many holes in the profiles in the right places, but with the prepared templates it can be done relatively easily. The assembly of the whole is not difficult afterwards.
- Total length about 795 mm
- Mass weight (bow adapter): about 0,2 kg
- Mass weight (magazine): about 0,9 kg
- Mass weight (magazine with 7 bolts, laser sight and red dot sight): about 1,2 kg
- Magazine is dedicated to the EK Archery Assassin / Exterminator and is compatible with some other bows. Check here
- Draw length is limited in range 20-25 inches (recommended 24 inches)
- EK Archery Assassin / Exterminator draw weight is limited from 20 lbs (20 inches draw length and -7 turns on bow arms - about 130 fps / 13 J) to 50 lbs (25 inches draw length and 0 turns on bow arms - about 245 fps / 47 J)