GUARDER SP170 Progressive AEG Spring

GUARDER Progressive AEG Spring

This expert product description was prepared by the ANAREUS.cz expert team. All rights to this unique content are tied to the anareus.cz domain.GUARDER progressively wound spring is designed for standard and upgraded AEG gearboxes based on the Tokyo Marui standard and manual SVD rifles. It is made from tempered Si-Cr wire, which provides the required flexibility, durability and good long-term stability. Irregular or progressive winding means that the individual coils do not have the same spacing along the entire length, which makes the initial phase of spring compression easier. In practice, however, the exact muzzle velocity of a specific gun cannot be determined from the SP spring rating alone, because air seal efficiency, cylinder volume, inner barrel length and diameter, hop-up bucking and other components have a major influence. For example, an SP120 spring may produce 115 m/s in one gun and as much as 125 m/s in another. After replacing the spring, we therefore recommend always checking the resulting performance with a chronograph. During installation, the end with the tighter coils belongs on the spring guide, towards the rear of the gearbox.

Approximate Performance of GUARDER Springs

The listed muzzle velocity values are approximate. Muzzle energy is calculated for 0.20 g BBs. Actual performance may vary depending on the specific gun setup, air seal efficiency, inner barrel length and diameter, and other components used, and may fall outside the approximate range shown in the table.

Key Features of GUARDER AEG Springs

Technical Specifications

• Type: progressive AEG spring
• Rating: SP170 (M170)
• Approximate muzzle velocity: 161–170 m/s
• Material: tempered Si-Cr wire
• Winding: progressive (irregular)
• Compatibility: standard TM-spec AEG gearboxes / manual SVD
• Installation orientation: tighter coils towards the spring guide

Package Contents

• 1× GUARDER SP170 (M170) progressive AEG spring

Frequently Asked Questions (FAQ)

Does the Spring Rating Precisely Correspond to the Gun's Final Performance?

No. The spring rating primarily serves as an approximate indication of its stiffness. Actual muzzle velocity and energy are affected by air seal efficiency, cylinder volume, inner barrel length and diameter, the hop-up assembly and other components used. The same spring can therefore produce different performance in different guns.

How Do You Choose the Correct GUARDER Spring Rating?

Use the desired gun performance and the approximate table above as a guide. However, keep in mind that the values in the table are not guaranteed results for a specific setup. After replacing the spring, we therefore always recommend measuring the actual muzzle velocity and energy with a chronograph and checking that the gun complies with the limits of your field or event. M130 and stronger springs are not suitable for standard stock gearboxes.

How Should a Progressive Spring Be Oriented in the Gearbox?

During installation, the end of the spring with the tighter coils belongs on the spring guide, towards the rear of the gearbox. We recommend checking the correct orientation before closing the gearbox.

How Do You Verify the Gun's Actual Performance After Replacing the Spring?

The most reliable method is measurement with a chronograph using the BB weight you normally use. This provides the actual muzzle energy of the specific setup. Measurement is especially important after changing the spring because the spring rating alone cannot determine the gun's exact final performance.