Nothing remarkable about the design, it's a conventional vortex block fed with 800 psi from a HPA remote line, but the calibre is certainly the smallest ever, at least on this forum. As you can see from the video below most shots will go clean through sheet acrylic or the aluminium skin of a beer can, that might not sound like impressive performance but remember that it takes 70 of these tiny projectiles to make up the weight of one 0.177" BB
![Wink ;)](./images/smilies/icon_e_wink.png)
Here's the obligatory 420 fps video, holes appearing all over the place like some mysterious skin disease:
[youtube][/youtube]
A couple of pictures of the setup:
![Image](http://www.spudfiles.com/forums/files/1mmbbmgcuring_134.jpg)
Basic components, vortex block and barrel, ball valve, paintball nipple and remote line.
![Image](http://www.spudfiles.com/forums/files/cimg0159_859.jpg)
The assembled layout, pictured with about 20,000 rounds of 1mm BBs (which can be bought very cheaply from eBay as "nail art" material)
Unfortunately, I can't get it to fire reliably, when it goes it goes but it tends to jam fairly frequently. My theory is that the barrel is a little tight and as the ammunition isn't exactly precision made, rounds tend to get stuck. I might have to find a way of sizing them through a piece of barrel tubing.