I received the Injury Industries rail in yesterday. I was a tiny bit disappointed as I discovered some machining marks that look like scratches about the three and 9 oclock rails going laterally. I was intending to go over them up Along with the ECS rail addresses in any case. https://knightsarmamentm4quadrail10639.bloggactivo.com/23670549/indicators-on-kac-quad-rail-you-should-know