How to Mount a Scope (on an AR-15 or AR-10)


With a detachable scope mount, you can store rifle, and optic separate from one another.  You can also use the same optic (& mount) on a variety of rifles if you record dope.

As part of the construction of Mr. Man’s AR-10 chambered in .308 Win, he purchased the Larue Tactical LT111 Quick Detach Scope Mount.  This mount gives the shooter a variety of options that a traditional picatinny mount, or other do not offer.  Larue Tactical has a variety of quick detach optic mounts that are designed in such a way that they will return to zero after multiple removal and returns.  This allows the shooter the following benefits:

  1. The option of using multiple sighting systems on the same rifle;
  2. The ability to store the optic and rifle separately for transport or long term storage;
  3. The option of purchasing one optic, and Larue mount, that can be exchanged between weapons.  You simply note the rail number or position on the rail, and record the dope on the scope for that weapon system.  When the optic is returned to that weapon, you can return the optic to zero for that weapon, and you are GTG.  This can be repeated for multiple weapons.

Anyway, I figured that I’d show the process that I use to mount the scope in the mounting system.  Note that this method will work with just about any scope & mount on the market with a few exceptions. It ain’t perfect, and there are tons of ways to do this, but this way has worked for me over the years.

How to Mount a Scope:

  • Secure the rifle in something that will not move, like a vice, or in my case cuts of felt wrapped wood that marry up to slots cut into my work bench.
  • Level the rifle in the vice (or the Santa’s work shop version of felt covered wood, like yours truly).
  • Then, attach the mount to the rifle.  After you attach the mount to the bases or picatinny rail, then re-level everything.  Run the level both parallel and perpendicular to the rifle, always using a flat surface to set the level.


  • Place your scope in the rings, and insure that you have proper clearance between the scope’s objective lens and the rail or barrel of the rifle, as well as any other items like flip up sights.


  • Next, place a level on the flat portion of the scope’s adjustment knobs/turrets, and make sure the scope is level parallel and perpendicular to the rifle.


  • Place the top of the rings on the mounting bracket, being careful to adequately align the parts.  After adding a little Loctite (clear fingernail polish will also work in a pinch), lightly tighten the mounts little bits at a time.
  • Being careful not to cross thread the screws, tighten the screws by doing them from corner to corner, little bits at a time until the sufficient resistance is reached.


  • Re-check everything with the level.  Then visually check to insure that the crosshairs are aligned properly.
Badass AR10

Mounted up, and ready to shoot stuff!

In case you are wondering, Larue Tactical has not paid me to say anything written in this article.  I’m just a curious redneck.

Categories: diy, hunting, Shooting

Tags: , , , , , , , , , , ,

5 replies

  1. Excellent article, as always. Never thought of using a level to facilitate the scope mounting process before. Might try doing this on my Type 56, to see how it goes. Thanks for the tip!


  2. Wow! Thorough, to the point, great visuals and outstanding guidance. Plus recommendations of quality tools that won’t brake the bank. You guys do it right! I’m looking forward to more!



  1. Quick Detach Scope Mount: The Larue Tactical LT111 Test & Review – Will It Return to Zero? – Greatoutdoordinary

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