I use the u.s. optics swivel level and it keeps me consistent.
hope this helps,
mike
While I like the way the USO level works, both examples I have seen have had issues. Neither are actually level, and one has a lot of play in it.
To the OP. I've been through several levels at this point. I think the biggest factors are: make sure it is able to display actual level or is adjustable. (USO and the AR one are not adjustable. Doesn't look like the JEC is either) and I have found that bubbles that do not stick out to the left side will suffer from parallax issues if you use your left eye. If your head position is off, the level will read differently.
The next one's i'm looking at are the flatline or the accuracy first. I'm not sure why the asymmetrical mount on the flatline bothers you. It looks like the best one of the bunch especially since it is adjustable in both positions. The torque required is not that great, and I don't think the forces applied are much different than traditional scope mounts. Just think of it as one side of the caps being already screwed down. I'm not engineer but I think the forces are nearly identical to traditional mounts.
One level I just picked up is the deros level grouse. It is an electronic level that seems like it will be faster to use,
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