If any of you remember, I'm the one who started up a thread a couple weeks back deciding between the Stag Arms Model 1 and Model 2. And you all persuaded me into ordering the Colt LE 6920. Well it's going to be coming in Tuesday. My questions is what is the length of the picatinny rail? I'm still trying to decide between an Eotech or an aimpoint I'm just really liking the field of view on the Eotechs and I believe with the Eotech 517 I can get a 1/3 co-witness. Problem is I don't know if it will fit along with a magpul buis. The eotech 517 has the buttons on the side so the buis can fit snuggly, the length of it is 5.6" and the magpul buis length is 2.8". Of course this is all going to have to wait awhile to save up enough money for the optics, I just like having everything planned ahead. Thanks for the help I really appreciate it. I'm learning slowly but surely.