Actually a remake/re-purposing of something I designed a year ago. I wish I could get outside but the path to the usual clearing I go to is currently blocked off by a stream that formed after some earlier weeks of rain. Hopefully it clears up soon, for now, until I find another spot, the best I can do to check accuracy is indoors at distances that are bit shorter than I'd like.
I recently re-strung this with the most powerful tubing I could find and a little bit of nylon rope for the parts that can't use tubing, The pull length might seem very short but the draw force is high enough to make up for it with these projectiles. Rate of fire may be limited, but the upside is that anyone can use this device and achieve good accuracy without much practice at all. The pop-up "hook" sight is a very simple system, and having the stock on the lowest part of the body makes it easy to sight down the rail.