Jurors on Thursday found a Vancouver man guilty of robbing two teens of a designer belt and some other items by using a stolen firearm.The jury deliberated for about 2 1/2 hours before handing down its verdicts to Cocaya S. Thomas. He was convicted of two counts of first-degree robbery with a firearm enhancement on each and possession of a stolen firearm.Senior Deputy Prosecutor Kasey Vu said Thomas faces 14 to 15 years in prison.Sentencing in Clark County Superior Court was tentatively set for July 24, the date of Thomas’ trial in another alleged robbery. He has a third trial set in August in an alleged shooting. Between the two pending cases, the 20-year-old is facing charges of first-degree robbery, attempted second-degree murder, first-degree assault and two counts of possession of a stolen firearm.In the pending cases, Thomas is accused of robbing a 17-year-old boy of a firearm, which he then allegedly used in the Aug. 12 belt robbery and during an Aug. 16 altercation with a man that resulted in shots being fired, court records show.Case chronologyThe alleged series of crimes began sometime in early August when Thomas met with the 17-year-old boy in a parking lot at Northeast Highway 99 and 63rd Street to purchase a .380-caliber revolver. During the exchange, Thomas brandished another firearm and took the revolver without paying, the affidavit states.