That put last year’s Northern Open champion level overnight with James McKinnon (Irvine) at the head of a field of 86.
Both leaders shot eight birdies and two bogeys. McKinnon had the better outward half, turning in 31 against Byrne’s 34.
But it was Byrne who eliminated the bogeys after the turn, coming home in 32. McKinnon, back in 35, dropped shots at the 15th and 17th in the middle of three birdies over the last seven holes.
They lead by one shot from Buchanan Castle’s Jason McCreadie.