you can feel if they need lapping. tighten them to the rail first and see if your scope slips right in. If there is no unusal resistance, you're all good. Probably you wont need to.
Never once have I ever had to lap anything from Seekins. If you lap them, you will not only be wasting your shooting time, but you will screw up a perfectly awesome set of rings!!
If reciever is not level, rings must be lapped to get perfect allignement. Its not too uncommon to see this- especially with low price mass produced recievers like R700.
Try it with lapping compound, just few pushes. Then check ring inserts- you'll see if black finish starts to dissappear unevenly. This means rings are not alligned.
Little off does not hurt but..better safe than sorry huh?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: fastbs</div><div class="ubbcode-body">If seekins rings seem to need lapping after attaching properly to your rail chances are something else is out of wack and the base needs bedding. </div></div>
That is a BIG +1 on that statement. Seekins bases, Seekins rings, nothing else is needed there. The receiver might, but not the stuff going on top of it.