M91 and M44/M38 Mounts are back in stock!

M39 Mosin Nagant Scope Mount Installation Instructions

Please take a moment to make sure you have the following parts & tools.

1 Advanced Rifle Parts M39 Mount Body Assembly


M39 Mount Assembly


Required Tools

  • Clamp or vise to compress rear sight spring
  • Punch or sturdy metal rod to remove sight pin
  • Assorted standard size Allen wrenches
  • Tin snips or a good strong pair of scissors
  • Flat Head screw driver
  • Please be sure wrenches and screwdrivers are sharp to prevent striping any screw heads.
required tools for installation


Step 1

Remove the barrel from your rifle.


Remove the barrel clamps on the front of the rifle then the two screws shown in the image above.

Carefully lift the barrel from the stock of the gun.


Step 1- disassemble rifle


Step 2

Use the clamp or vise to relieve spring tension on your rear sight and hold it in place while the pin is removed. Do not tighten the clamp too tight or it will be difficult to remove the pin. Also use scraps of paper or pieces of wood between the metal surface of the clamp and your rifle to prevent any surface damage.

Carefully remove the pin by taping lightly on it with the punch or metal rod- as long as the clamp is not too tight you should be able to remove it easily. Be sure not to lose the pin, you will need it for the next step.


Step 2 - Remove sight pin



Step 3

Once you have successfully removed the pin carefully release the clamp and remove the range sight. Beneath the sight you will find a sturdy leaf spring, keep this spring in place.


Step 3 - Spring leaf


Step 4

Line up the mount rail above the rear sight pin hole and using the clamp and wood or paper as before carefully line up the holes in the rail to the rear sight. Once the pin hole are lined up carefully drive the sight pin through the holes until it is nearly flush on both sides. The pin should go in with little resistance, if you notice resistance check the hole alignment again. Forcing the pin could damage the mount or mess up the finish.

Step 4 - replace pin


Step 5

Make sure the rear of the Mount is resting on the hex receiver. Carefully tighten the setscrews alternating from one side to the other to ensure the mount is aligned down the center of the barrel. DO NOT OVER TIGHTEN! Use only the short end of the Allen wrench when tightening the set screws.

Step 5 - set screws


Thats it!


Place the barrel back in the stock and secure it with the two screws and barrel clamps. Use the scope rings of your choice. Happy Shooting!

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Finished M39 Mosin Nagant Scope Mount Installation (no scope)


M39 Finished Installation