Builders FirstSource (BLDR) is one of the stocks most watched by Zacks.com visitors lately. So, it might be a good idea to review some of the factors that might affect the near-term performance of the stock.Over the past month, shares of this construction supply company have returned +12.1%, compared to the Zacks S&P 500 composite's +5.3% change. During this period, the Zacks Building Products - Retail industry, which Builders FirstSource falls in, has gained 10.5%. The key question now is: What could be th ...