I don't know if it's already been covered but the Centurion also has 4 QD's integral to the rail. If you don't need a full rail the MOE makes sense. One thing to remember about the MOE is that the $30.00 entry fee is not realistic if you're adding accessories. You can add a lot of dollars in a hurry when you start adding sling swivels, rails, light mounts, etc. I have a friend that has almost $200.00 in accessories added to his MOE. He should have bought a free float rail as he ended up adding a Scout light, sling swivels on both sides, VFG and a rail underneath for a bipod of all things.

I started with Troy MRF's and they are a solid albeit heavy option. I currently own Troy Extremes, Viking tubes, and 2 Centurions. If I didn't go with the Centurion my next choice would be the DD light rail system. Remember the goal of all that most of us never make, buy once, cry once.