Picatinny Ring Mount | 40 mm | Screw

This assembly is anodised. Anodising creates a protective oxide layer on the aluminium surface, providing good corrosion protection and a durable finish. Anodised products can withstand daily use and are resistant to scratches and wear.

Hard anodising (Type III) provides a thicker and harder layer than standard anodising and is typically used on products subjected to extra heavy wear.

Installation is simple. Attach the rings to the Picatinny rail, place the scope in the lower ring halves, then tighten the upper halves.

Manufacturer's recommendation:
• Torque for ring screws (top, M3.5): 1.8–2.0 Nm
• Torque for rail attachment (M4): 2.0–2.5 Nm
• Ensure the scope is level and has correct eye relief before final tightening

A torque wrench is necessary for correct installation. Overtightening can damage the scope tube.

Scope mounting: Read the guide here

This mount is made from 7075-T6 aluminum – the same alloy used in military equipment, aircraft structures, and high-end climbing gear. 7075-T6 has a strength-to-weight ratio almost twice that of steel and is the preferred material for many professional shooters.

For the vast majority of hunters and shooters, 7075-T6 aluminum is at least as good as steel. The material is lighter, does not corrode, and will last for decades of use under normal conditions.

Rusan is a Croatian manufacturer with over 30 years of experience in precision mounts for rifles. All products are manufactured in-house on modern CNC machines from solid material – without casting or metal injection. Rusan is known for tight tolerances, high repeatability, and an unusually wide range of rings, mounts, and adapters for night vision optics.

Read more about Rusan here: Rusan

See all products from Rusan: Rusan collection

The mounting height of rings is typically given as BH (Base Height) — measured from the top of the picatinny rail to the bottom of the scope tube (the saddle).

When calculating the total height (Center Height), you should add the radius of the scope tube to the BH measurement. For a 30 mm tube, the radius is 15 mm. For a 34 mm tube, the radius is 17 mm.

Formula: Center Height = BH + r

Remember that the picatinny rail itself raises the mounting point (typically 5-10 mm depending on the rifle model). This means that you can often choose a lower ring than you would otherwise need.

Rule of thumb: Choose the lowest ring height that still allows free passage between the scope's objective and the barrel. A lower mount provides better balance and a more natural sight picture.

These rings have an internal diameter of 40 mm and are suitable for scopes with 40 mm tubes.

Always check your scope's tube diameter before purchasing – it can be found in the scope's specifications or easily measured with a caliper.