I built my first AR a couple of months ago, it's a Spike's lower with an RRA Tactical Entry upper.  I've been having a lot of fun shooting it, but now I'm thinking about adding a few accessories.  The first thing I want to put on it is a light and I've been looking at some mounts that attach to the bayonet lug.  If there's anybody out there using these that would be willing to let me know how they are working for you I would really appreciate it.  

I'm using a Hahn Precision barrel mount.  I had to massage the lower portion of the mount to fit the bayo lug, but it's solid and handles the heat well.