It's a Troy Alpha Battlerail. Yes modifications are needed but i just used a dremel and a lot of patience lol. I had to:
- trimmed off the one anti rotation pin on the left side of the rail, 1 minute
- trimmed off 2 tabs on the standard AR barrel nut so that the gas piston spring clears the nut, 5 mins
- opened up the top about 8 rail slots. 3 hours
- put on 2 coats of engine enamel on any bare metal surface
- put rail cover on opened top section to prevent fingers touching the gas block
The gas/piston block is now free float and doesn't touch anything.