What is your favorite bubble level?

I put low-profile Knight's Armament levels on each of my rifles. They're overpriced and can be a pain to mount on certain rails, but I love them - especially for hunting application, where I have found them to provide the quickest indications for canting.

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In terms of what type to purchase, definitely get a scope-mounted type. One that mounts to the rail cannot be leveled to the thing that matters which is the reticle.

Really, pretty much any level that's $5 - $20 will properly indicate level. Perhaps there is some argument to be made regarding durability with some levels but hopefully it never experiences any severe shock since they are mounted on a scope.

So I don't see any good reason to spend much on a level. Spirit level technology is simple, after all. And it's quite mature; it's been around since 1661. A spirit level epoxied into an extruded aluminum clamp can be made quite cheaply without sacrificing anything important. I'm sure these sentiments will be met with some resistance but that's my take on it.


 
Being severely OCD with my rifles and having leveled my rail mounted levels with my scope near perfect, I'm going to have to disagree with nervoustrig's statement that it's not possible lol - with the exception of a 20MOA Pic rail riser mount that I got from Amazon, the rail itself was garbage and I returned it. Viva la resistance 🤘
 
I'm not saying it's impossible to set up a rail-mounted level correctly, but in many cases it will require shimming the dovetail to introduce some rotation to it. There are about a half dozen sources of alignment error that renders the receiver out of square/level with the reticle & bore combination.

The more unfortunate thing is that most users will simply fasten it to the rail and assume they can use it to indicate level and that will almost never be true. Whereas a scope-mounted level can simply be rotated about the scope tube to achieve the proper alignment.
 
I'm not saying it's impossible to set up a rail-mounted level correctly, but in many cases it will require shimming the dovetail to introduce some rotation to it. There are about a half dozen sources of alignment error that renders the receiver out of square/level with the reticle & bore combination.

The more unfortunate thing is that most users will simply fasten it to the rail and assume they can use it to indicate level and that will almost never be true. Whereas a scope-mounted level can simply be rotated about the scope tube to achieve the proper alignment.

I agree for the most part. I use both methods. If they dont agree I know I need to relevel at least one of them.

I have found redundancy is my friend, is my friend, is my.......
 
A VERY IMPORTANT point to be made with CANT levels is being able to view them while your looking threw your scope, or at minimum with your head in the position your sighting threw the scope. If you need to move your head around to view the bubble your likely to not be level when your back in the shooting position.

Say if a RH shooter, it is with some practice possible to view the bubble with your left eye. As a FT shooter this little trick in training your eyes pays dividends.
 
I totally agree with nervoustrig for the same reasons. Simple is best in this case. Motorhead makes a good point as well. The problem with a lot of people my age is we don't need glasses to look through the scope but can't focus on anything up close without them. I don't want to carry or wear readers whilst hunting. Mounting the bubble forward of the turrets can help but you need to move your head to get an unobstructed view. No matter where I mount it, it's a compromise. Just behind the turrets on the left side is the best I can come up with. 
 
I totally agree with nervoustrig for the same reasons. Simple is best in this case. Motorhead makes a good point as well. The problem with a lot of people my age is we don't need glasses to look through the scope but can't focus on anything up close without them. I don't want to carry or wear readers whilst hunting. Mounting the bubble forward of the turrets can help but you need to move your head to get an unobstructed view. No matter where I mount it, it's a compromise. Just behind the turrets on the left side is the best I can come up with.

Same here. I've started removing my levels because I can no longer focus on them from shooting position. I suppose if it were critical (competition or extreme long range shooting) one could remove the right lens from a pair of readers and use the left lens only to see the level.