When tightening mounting screws on rifle for picatinny rails, we often get asked how tight is tight enough? And when does tight become too tight?

Most rifles have a picatinny rail scope mount attached with screws. Scopes and optics then mount on top of this rail, so it has to be secure.

Loose screws (under-tightening) can cause the rail and scope to move (which has huge effects on accuracy). But over-tightening can strip the screws or deform the rail.

What torque settings should I use on my MANAEL Scope Mount Picatinny Rail?

We recommend tightening MANAEL scope rail screws to 15 to 16 torque inch-pounds.

Torque settings can vary depending on your rifle make and model. Most manufacturers recommend torquing the screws between 15-20 inch-pounds. So its worth checking with your rifle manufacturer also.

As a general rule, picatinny screws can be wound up to “hand-tight” (apply firm, but not excessive, pressure to your tightening tool) and this is usually sufficient.

How can I stop my Scope Mount Rail Screws from coming loose?

For extra peace-of-mind, some people apply compounds to ensure scope rail screws stay in place.

You could use a fastner like Loctite and those screws will not budge. But good luck ever getting them undone ever again!

We suggest starting with nail polish because it creates a firm bond but easily can be broken with the force of hand tools if you need to undo or adjust the screws. 

For those who have lost their scope rail screws, we have you covered with replacements. Read more about Finding the Right MANAEL Scope Rail Screws for Your Rifle

How do I measure torque when tightening my scope rail screws?

The easiest and most accurate way to measure the torque settings of your screws is with a torque wrench. This is a tool that measures and controls the amount of force applied to a bolt or screw.

Many rifle specific torque wrenches look like screwdrivers with interchangeable heads, but there are many styles.

As you are tightening the screw with the torque wrench, the tool will measure the tension going into the screw head. It will signal when you’ve reached the desired tension. This helps prevent over-tightening.

Some torque wrenches will have a physical block that prevents you tightening once it reaches the desired measurement and some click or give another signal to stop tightening.