http://www.airsplat.com/Items/ER-KWA-M4S-SIR.htm Jake and Kristen do an in-depth review of the extremely customizable airsoft M4 SIR. This thing not only offers superior performance, but also allows you to attach anything you might need to get the job done. This airsoft electric rifle takes nearly everything into consideration and offers it to airsoft players in one complete package.
