Not sure if anyone can help find any information with so little detail to start with but here goes!
David Hunter, born c1720 in Aghadowey Parish, County Londonderry, Ireland. Went to Nova Scotia with his family and died there in 1810. At least one brother John Hunter (born c1736) stayed in Ireland. I don't know their father's Christian name but there are lots of males called James, William, George, Samuel and Joseph in the next few generations.
From family notes in Canada- “… [David] could boast of two brothers being in the “King’s Own”, where the qualifications were: six feet in height and perfect in every physical respect.”
Even if I can't find two tall Hunter brothers born in Aghadowey Parish it would be nice to understand which Regiment they might have belong to. I did try searching 'King's Own' in Google but am not much the wiser.