Mounting a Picatinny Rail – Guide

Mounting is brief but crucial. A few minutes of care regarding threads, torque, and placement prevents the majority of problems that otherwise arise over a season. Always follow the manufacturer's mounting instructions if the rifle or rail manufacturer specifies different values than the general ones given here.

Tools and preparation

  • Torque wrench with 1-6 Nm range and appropriate bits (Torx or Allen).
  • Blue threadlocker, not red.
  • Degreaser – isopropanol or a light petroleum-based cleaner.
  • A soft cloth and a small brush.
  • A cotton swab for the threaded holes.

Before you begin

  1. Verify that the rifle is unloaded. Remove the bolt and magazine where possible.
  2. Securely place the rifle – preferably in a block vise or a short bench with a vise.
  3. Identify the screw type and number of screws. This varies between rifles, and incorrect bit size will damage the screw head.
  4. Check that the rail fits the rifle's footprint. If in doubt, look up the model in the guide to finding the right Picatinny rail or via the product page's specifications.

Step 1: Clean the threaded holes

Use a cotton swab with degreaser to remove oil, dirt, and old threadlocker from the holes in the receiver. Threadlocker will not bond in an oil film. Allow the threaded holes to dry completely before proceeding.

Step 2: Wipe the screws

Wipe the screws in the same manner. Inspect each one for wear or deformed threads. Use new screws if there is any doubt.

Step 3: Place the rail

Place the rail on the receiver and check that it lies flat and straight. The rail must not be crooked – this indicates unclean surfaces or an incorrect fit.

Step 4: Apply threadlocker

A thin layer of blue threadlocker on the screw threads themselves is sufficient. Avoid getting adhesive in the bottom of the hole or on the rail surface itself.

Step 5: Tighten in a cross pattern

Insert all screws and gently tighten them with your fingers first. Then tighten to the final torque in a cross pattern, so the rail is pulled straight down. Always follow the manufacturer's mounting instructions for tightening. As a reference, many 6-48 base screws are around 15-20 in-lbs, while 8-40 screws are often higher. Do not use Nm values indiscriminately on small base screws. Use a torque wrench – not intuition.

Step 6: Allow threadlocker to cure

Blue threadlocker typically binds in 10-30 minutes and is fully cured after 24 hours. Do not mount the scope until it has cured.

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