The 20-year-old Old Victorian won the elimination shoot by 443.1 points to 439.4 against Gotland’s Frida Eriksson at the Rifle Shooting Range.
Pirouet excelled in the morning’s qualification shoot by finishing 44 points ahead of Orkney’s Robert Spence, who went on to finish third overall in the elimination rounds.
Pirouet topped the leaderboard in all three disciplines in the qualification, 386 for kneeling, 398 for prone – after two maximum 100s and two 99s – and 379 for standing.
Fellow Jersey shot Toby Baillon (16) missed out on qualifying for the elimination round by two points after returning a total of 1,163 points.
Guernsey’s Nikki Trebert retained the women’s ISSF 25m Standard Pistol title after scoring 526, seven points in front of her nearest rival and six short of her Island Games record score posted in Gotland two years ago.
Jersey’s Mary Norman and Amy Hall placed fifth and ninth respectively on scores of 482 and 447.
Nikki Holmes collected gold for the third time in four Island Games, although she did not travel to Gotland two years ago, after winning the ISSF 10m air pistol discipline.
Champion in 2015 and 2013, Holmes won through the eliminator to defeat Gotland’s Eva Widing with a score of 204.5 to 202.2 for a grand total of 1,095.
Mary Norman, who won gold in the team event with Holmes, placed fifth.
Home marksman Jonathan Patron now has a full set of medals after winning the men’s ISSF 25m standard pistol match, by seven points, from Gotland’s Peter Nordgren, the current record holder.
Patron registered a score of 548 with Jersey’s Michael Quénault and pistol team manager Gregory Guida carding scores of 507 and 462 for joint-ninth place and 19th respectively.
Quénault and Guida paired up for the men’s ISSF 25m Centrefire team match and a combined score of 1,028 secured them fifth place. Saaremaa claimed gold with 1,129, five points adrift of the 1997 Games record score by Jersey’s Derek Bernard and Dave Ward.
Meanwhile young Thomas Burns is currently second, on countback, in clay pigeon’s Automatic Ball Trap Individual Open after three of the five rounds.
The 16-year-old Jersey lad was joint top after the first 25 birds, on 24, but a 22 and a second 24 leaves him ahead of Guernsey’s Darren Burtenshaw with the pair four birds behind current leader Alex Johannesen, of the Faroe Islands, with two rounds remaining.
