The Meadow Park men continued their goal-laden pre-season programme with a 6-1 success.
Yet Jarrow opened brightly and grabbed a fifth-minute lead at Perth Green before Steph-en Callen nodded home an equaliser midway through the first half.
Luke Page headed home a right-wing cross to put RCA in front, then Colin Larkin struck twice in quick succession to make it 4-1 at the break.
Summer signing Mark Davison extended ther visitors’ advantage early in the second period, before Larkin hit the bar.
Defender Ross Preston made it six with 18 minutes to go, nodding home a Ross McNab corner.
RCA’s final friendly is at Chester-le-Street on Saturday. Their First Division campaign begins at home to Newcastle Benfield on Saturday, August 4.
Conor Winter netted the opener, and hit the bar soon after, for Willington in a 3-1 home loss to Spennymoor Town in front of a crowd of 320.
Captain Rob Atkinson’s header levelled matters, before Mark Anderson and Andrew Johnson, from 20 yards, gave Moors the win.