Jersey ran in five tries as they beat previously unbeaten Nottingham to record their biggest win since being promoted to the Championship.
Early tries from full-back Tommy Bell (2) and centre Drew Locke put Jersey in control, but Will Maisey's kicking kept the deficit to 22-12 at half-time.
Mark Foster and Nick Haining then scored after the break to ensure the visitors' first win of the campaign.
Jersey finished with 14 men after prop Nacho Lancuba was sin-binned late on.
Nottingham had gone into the game on the back of wins over Plymouth Albion and Bedford, but they were soon behind against a Jersey side who looked bright right from the off.
With little over a minute gone, Bell grabbed his first converted try, but two Maisey penalties narrowed the gap to a single point in a lively opening spell which also saw Nottingham scrum-half Sean Romans forced off injured.
|Twitter message from Jersey's Chief minister . . .|
|"Well done Jersey RFC. A well-deserved victory. Looking forward to watching you play Rotherham next Saturday. Keep it up."|
|Senator Ian Gorst|
Bell's second, in the corner after he chased onto and collected his own kick, re-established the advantage for the visitors before Locke's score by the posts completed a sparkling first 20 minutes for Jersey.
Two further penalties from fly-half Maisey made sure that the hosts were still in contention at the break but Jersey were not about to let a second-half lead slip away for the third weekend in a row.
Bell's second successful penalty of the afternoon, soon after the restart, kept the islanders' momentum going before 31-year-old winger Foster showed strength to power round the side of a ruck and ground the ball for the bonus-point-winning try.
Jersey were not done yet though and, just three minutes later, were celebrating a fifth try inside the hour, working the ball along the line nicely for fit-again flanker Haining to ground in the left corner.
Bell's conversion made the final score 39-12, with the 27 point gap Jersey's biggest ever winning margin in the second-tier of English rugby.
Nottingham: Robinson; O'Neill, Styles, Munro, Hough; Maisey, Romans; Ma'afu, Malton, Holford; Freeman, Montagu; Calladine, Wilson (capt), Grant.
Replacements: Carey, Vickers, Cooper, Everard, Smit, Knight, Venus.
Jersey: Bell; Foster, Locke, Robling, Burroughs; Bentley, Griffiths; Lancuba, Garcia-Veiga, Williams; Phillips, Rae (capt); Haining, Hodson, Noone.
Replacements: Harris, Herriot, Markham, Kaho, Pointer, McCrea, Dudley.