This group descends directly from Niall.
Any participant with Family Tree DNA who is a direct descendent of Niall will have a Niall of the Nine Hostages banner on their personal page at the FTDNA website (click the banner on your personal page for further information). If they have this banner, it means that they match others who, after doing the deep subclade test for R1b1b2, tested positive for the Niall SNP M222. FTDNA errs on the conservative side, so I am comfortable with their determination of a presumed match to M222+. Any participants with the banner can decide for themselves whether they want to verify it by ordering the subclade test.