I looked in vs stickies and did not see an Interceptor vs Remains thread.
Since the subject comes up quite often it seems like there ought to be an easy place to send people. Anyway, I own both so I'll comment. The Interceptor is a full on tournament level gun. It's light, fast, reliable, very consistent, reasonably effiecient and easy to maintain. The Remains is just a little bit more of all those things. The major differences for the Remains being:
1. Noticeably lighter
2. Refined build quality
3. Better LPR
4. Lower operating pressure/ram bumper- no kick.
5. Smaller, lighter trigger- faster and smoother when set up correctly.
6. Better trigger plate system- much easier to put back together.
7. Better stock barrel- the 14" Invasion is spot on.
It's not much but these subtle refinements add up to a better gun. Yep, the Inteceptor is a great gun in it's own right but in this case You do get what you pay for.