You can get all tecky with setting up scope but if you have a detachable mag this works well.
Remove mag and bolt.
Sit at right angles on a level surface,(it must be square because the mag box will be on an angle) sitting on the mag box. I use the kitchen bench.
Line up on a known level or plumb surface,Distant doorway or wall, horision on water etc.
Done.
This will get you really really close if done right.
Now people will say that if the mag box,barrel and scope are not all in line this will cause an error witch is true but we are not talking about a cheap shit rifle.
They may allso say that the cross hairs and the actual movement of the rectical might not line up either and it is better to use a level on the turret but be aware that your turret may not be true.Check by getting level and rotating turret half turn and rechecking.Mines not true!
Also if the recticle doesn't line up with the actual movement it would mean you would have to use it with the recticul on the piss to dial up in a straight line.But I doubt you will have that problem with a mark4
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