Truly modular but... - ATI Outdoors AR-15 Carbine Free Float Forend Combo Rail Package with Two 6in. , Two 4in. , & Two 2in. Aluminum Picatinny Rails

This was my first ATI purchase and I was a bit skeptical of the quality. I am happy to report that the quality is respectable and I have no complaints about its fit, finish, or function. My only complaint is that the included 6" sections will not align with the top of a mil-spec upper. The rails are approximately 1/8 inch higher. This isn't noticeable on the bottom or sides but it can be a problem on top. They sell a low profile rail separately (ATI A.5.10.1351) that I will now have to order and that pushes the package price to about $175 which is too high in my opinion. If this kit would have come with one normal and one low profile rail, I would have given it 5 stars.