Collins could not inspire GB to a first wheelchair rugby medal
Britain missed out on a first wheelchair rugby medal after they lost the bronze-medal match 41-47 to Canada.
Troye Collins top scored with 16 points, but GB were outscored in every quarter as Canada eased to victory - USA beat Australia 53-44 to win gold.
"I'm absolutely devastated," said Collins, a veteran of three Games. "We just made too many silly mistakes."
Meanwhile, GB's seven-a-side football team hammered China 10-2 to win their first game and finish seventh overall.
All seven outfield players scored with midfielder Michael Barker notching four.
"It's great to go out like that," said defender Matt Ellis. "We've not had a great tournament but it's fantastic to end on a win."
Matt Dimbylow scored in the opening minute before setting up Barker for his first after 18 minutes.
Mark Robertson, Junior Gordon and Graeme Paterson made it 5-0 at half-time.
Ellis claimed the sixth with a left foot curler before captain Jonathan Paterson made it seven and Barker added three more.
Ukraine won the gold medal with a 2-1 extra-time victory over Russia.