I recently found a deal on an AR 15 and took advantage of it and bought it. I have fired the gun and it shoots well but I was wondering if anyone had information on the lower receiver it has sportswereus stamped on it. I have never heard of this type of lower before and was wondering if it is a mass produced lower or one that was forged by an individual or small company? Another question that I have is if anyone might know the safety switch has a bullet for fire, and another one with a line through it for safe, but there is also across from the fire symbol three bullets and was wondering if this means that I can make it fully auto or three shot burst? Any information would be greatly appreciated. I am new to this forum so any info on what I should do to make my post better would be greatly appreciated. Thanks