Long Shadow Sniper Rifle

Hey everyone, I pushed forward on one of I scifi weapon designs, and finally made it a sniper rifle.
I did the 3D reference in Maya and redesigned some features, rendered 2 images in Keyshot(1 outline, 1 shader), and did the rest of the painting and post-process in Photoshop.
I'm not very happy with the quality of the outline render because there are too many jitters on the line, will try to paint it over in my next piece, or if you know any better idea please let me know!
Thanks!