When they designed the STAG-15 series, Echo 1 had a focus to create a detailed replica of the MR carbine used by the US and other military units worldwide. They even matched the coloring of the new receivers to adhere to the original. Each receiver is engraved with fully licensed trademarks from STAG ARMS which dramatically heightens the rifles realistic appearance. STAG ARMS manufacturers the real 5.56mm cal. rifle and is one of the largest manufacturers of AR type rifles in the United States today.