This is a custom AR10 built on an Eagle receiver. The builder is the head of R&D for EDM arms, and the designer of the Windrunner series of 50's, .408' etc. This one is the prototype for the 2011 .308 lineup for EDM. This prototype has a lot of custom features not found in the others.
She has a custom, internally re-machined Eagle AR10 receiver/magazine well cut to accept a slightly longer AR10 custom magazine, this because of the required OAL.
All internal receiver areas are coated with a Tungsten Disulfide Matrix derivative. The chamber and throat are cut to accept one projectile profile only. The Sierra 175 MK, and no other. Because of these cuts the TTL, seat depth and OAL are specific and critical, thus the need and reason for a custom machined Mag-well.
Walther 17-4 S/S barrel, internally tapered .006 electro-polished bore and a 1-10 ROT.
SWS foregrip and a prototype trigger from his inventory that later evolved into the Chip McCormick trigger.
Around 15 years ago he bought some 150 Eagle receivers to build his 1,000 yard rifles. This is one of them. He told me its a simple flip of the coin as to which receiver you'd want to use, but he got a great deal on these in bulk, so he used them. I'm a believer.