Eemann Tech Progressive Recoil Spring for 1911/2011

The Eemann Tech Progressive Recoil Spring is designed for 1911/2011 pistols and their clones with a 5" barrel length.

The Progressive Recoil Spring stands out from common springs due to the decreasing distance between coils, starting from the middle of the spring to the last coil.

When pressure is applied, the spring operates in two phases:

• 1st: The first half of the spring, with identical coil spacing, begins compressing from the start.
• 2nd: Once the first half is fully compressed, the second half, with reduced coil spacing, begins compressing.

Each coil increases the spring's compression. Full compression provides maximum resistance and reduces recoil impulse.

Every Eemann Tech Recoil spring is uniquely colored for easy visual identification of its power value throughout its service life.

All springs are coated with polymer heat-treated paint, which remains flexible throughout their service life. The paint does not damage or stain the handgun internally.

Table of Colors:

• 6 lbs - DARK BLUE
• 7 lbs - DARK GREEN
• 8 lbs - GREY
• 9 lbs - BROWN
• 10 lbs - MAGENTA
• 11 lbs - GREEN
• 12 lbs - BLUE
• 13 lbs - WHITE
• 14 lbs - RED
• 15 lbs - ORANGE
• 16 lbs - ROSE
• 17 lbs - YELLOW
• 18 lbs - BLACK

Note: The Eemann Tech Progressive Recoil Spring fits:

• STI 1911/2011 standard 5" Factory Steel Guide Rod
• STI 1911/2011 5" Recoil Master system

No fitting is required for most cases, allowing for instant installation. However, some pistols may vary in production or be pre-modified, potentially requiring the assistance of a certified gunsmith for installation.