I'm new to this forum. My first Ruger was the 556, and my fiancés Valentine's Day present was the full size 9mm ruger American. We went this past weekend to go shoot, they were both great. The 556 did great one fail with the 90 rounds I put through. The ruger American never failed once with 350 rounds through it. Remington umc through the ruger American and hornady black box through the 556. Great guns. I love ruger. My 556 has the magpul accessories and axts raptor charging handle.