Shares of Axon Enterprises (NASDAQ: AAXN) stock -- the company formerly known as Taser until it decided its real future lies with selling Axon body cameras for police -- jumped as high as 10% in early trading Friday and were up a good 8% as of 3:30 p.m. EDT.The reason? This morning, Axon announced it's agreed to buy its longtime rival Vievu.If you can't beat 'em, eat 'em.