M4_Fanatic: I made my bfa using 2x20mm and 30cm long peace of metal which i then bended and added 5x20mm and 3cm long bit of metal to the end and on the other end two filed nuts. Then you have to weld hole thing together. The thing that tightens the whole thing to flashider is just filed bolt. Cost's like 5£ if you have all the tools to make it. Though it's not the easiest project to do, and takes some time as well.
tom lawson: What's wrong with my sling? What should i do to it?