I don't know, I have not used the M417 to really judge it in depth. I hate going against it though, to me it felt like a very BS weapon. As powerful as an M39, but has a fairly high mobile accuracy (From my experience) fires faster, and appears to have fairly low recoil.
It seems to trump every other semi auto sniper out there, why would you use them in the aggressive sniper role when the M417 can easily outclass them at both close and medium to long range?
Also, what's wrong with the MTAR? It's a great weapon at medium to close range, but you'll never hit anything beyond that from my experience with the gun.