Good advice from these chaps.
Sorry to harp on about this, hopefully your receiver is spot-on.
I like the idea of using a one piece rail, it's a solid straight backbone which should give the best potential alignment for your scope. Some people feel a drawback is that access to the chamber is restricted, I must have small fingers, not a problem for me.
I found that my receiver was wonky with this one test.
Finger tight both individual mounts to the receiver, then finger tight the ring bases to the mounts, then fit the scope and finger tight the rear cap to the rear ring base.
When I did this, the scope would not seat into the front ring base, in fact I had about a 1/8" gap. You can appreciate that if you have this issue and force the scope down into the front base there will be allsorts of nasty stress applied.