Does not work on ar-15. only works on ar-10. - Wilson Combat Rifle Length Gas Tube

I only took off a star because I think they could have been more obnoxious about this not working in an AR-15. Entirely my fault for attending the school for kids who can't read good. Bought in haste after seeing not many other rifle length AR gas tube options. Read the first few words and not the whole description. Wilson Combat makes good stuff.