Re: Sampson EVO rail ?'s
I have a 12" Evo rail and had a bear of a time sighting in my irons. I started researching it an found my rail was angled up too. I called Samson (very nice folks) and Andrew's advice was:
"Loosen the two screws a little bit
Pinch the barrel and top part of the rail together (or hold down on the rail)
Tighten the rear screw snug
Tighten the front screw snug
Tighten the rear screw
Tighten the front screw"
He also said you can really tighten the screws, as long as the parts that go over the barrel nut are on right you won't hurt it.
It *should* be pretty well level. If not you can adjust by how much pressure you hold down on the rail when tightening the screws.
Of note, I haven't shot mine since I adjusted it but with the short level I have it's pretty level now.