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The Te Akau colt had run into traffic problems in the Gore and Dunedin Guineas and trainer Jamie Richards did not want that to happen again in the final leg of the southern guineas triple crown.
He and rider Dylan Turner had a game-plan to stay out of trouble and it was followed to perfection.
"He [Weaponry] hasn't really had the run of the green in his last couple of runs," Richards said.
"He got caught behind horses at Gore two starts ago and then again at Wingatui last time.
"I spoke to Dylan before the race and basically told him not to be unlucky this time.
"He bounced out of the gate nicely and then when the pressure went on, he got him into the clear and in a spot where he could dictate from, so it was a very good ride."
Punters are unlikley to see the gelding in the South again any time soon.
"There's not a lot left for him down south so he will probably come home [to Matamata] now for a spell," Richards said.
"I think he has potential, but he will definitely be a better horse as a 4yr-old.
"He can have a break now which will only be of benefit to him then we can decide where we go with him next."
Weaponry ended the hopes of a clean sweep of the southern guineas races by the Riccarton-trained Air Max.
The horse's chances were effectively over when he was trapped three wide early in the running. Jockey Terry Mosely was forced to work the Lance Robinson-trained gelding forward to sit outside the leader, Fire Show.
Air Max was unable to sprint with Weaponry and runner-up Upscale before the home turn, but he battled on well to hold third.
Riverton galloper Orepuki Lad gave his sire, Raise The Flag, a fine birthday present by winning the Invercargill Gold Cup by nearly eight lengths.
The sire turned 14 on the same day his son, trained by Graham and Michael Eade, blew his rivals off Ascot Park in the 2600m feature.
He was backing up from victory in the Dunedin Gold Cup earlier this month.
The Eade stable won the Dunedin and Invercargill Gold Cups double two years ago with La Nouvelle Vague.
Tomm Jones continued his sparkling form by winning the Southland Stakes.
The horse went one better than his last-start second placing behind He Kin Fly in the listed Timaru Stakes at Riccarton.
Kiwi Ida ran into second behind Tomm Jones to give Balcairn trainers John and Karen Parsons the quinella in the 1200m open handicap.