Re: Leupold long range tactical
To answer some of your questions, if the scope you have is like the ones I have then yes they are very good scopes and do compare well with the mark4 scopes considering they are essentially a Mark4 scope.
By the number you provided the "L" suffix indicates the scope was built in 2003 and if it is a Vari-X III Long Range Tactical it has M1 knobs and probably a mil dot reticle also it will not have the golden ring it will have the blacked out ring, all this will be how it originally came from Leupold. It will not be like the scope in the link provided above. It will look like this:
These scopes are part of Leupold's tactical line before late 2004 when the Vari-X III line was discontinued and the VX-III line was started. All the tactical Vari-X III scopes were incorporated into the Mark4 line which at the time were only fixed power scopes, so the Vari-III Long Range Tactical became the Mark4 LR/T in variable power.
As you can see in the picture below the product number is 54680-P, Leupold still uses the product number 54680 to designate it's Mark4 LR/T mil dot M1 scopes.
Now you should be able to tell which scope you have a Vari-X III Long Range Tactical or a Long Range Target as pictured in the link above. If you have a scope like the one I've provided info about,<span style="font-weight: bold"> IMO again IMO</span> it is as good as newer Mark4 scopes in build quality and glass quality to my eyes. I have a newer Mark4 built in 2009 and two of the Vari-X III tactical scopes and to me I can't personally tell much of a difference in the glass quality, I will however say that the older M1 knobs on the Vari-X III tactical feel more solid (stiff) to me when making adjustments.
Now I'm not a scope guru or an optical engineer or an engineer of anything else so the statements above about glass and build quality are my personal opinions and should be taken as such. The information above to the best of my knowledge is true, you should be able to call Leupold with number you provided and confirm which scope you have.
Kevin.