Transforms the Cobra System ADDER into a significantly more compact and powerful compound repeating crossbow.

The ADDER TX Upgrade Kit replaces the original recurve front end with a modern compound cam system. Despite maintaining the same maximum draw weight of 130 lbs, speed increases from approximately 240 fps to up to 300 fps. At the same time, the cocked width is reduced dramatically from 15.5” to just 6.85”.  

This makes the ADDER noticeably more compact, faster, and easier to handle in confined spaces while retaining the proven underlever cocking mechanism.  

Package Includes

• ADDER TX 130 lbs compound limb system
• Trigger mechanism with rail
• 10 x 7.5” heavy carbon bolts (240 grain)

Specifications

• Speed: up to 300 fps (205 gn)
• Draw weight: adjustable 99–130 lbs
• Power stroke: 8.25”
• Kinetic energy: 55.56 Joules
• Width cocked: 6.85”
• Width uncocked: 10.5”
• Front-end weight: approx. 3.6 kg

Advantages Compared to the Standard ADDER

✅ Much narrower profile (6.85” vs. 15.5” cocked)
✅ Up to 25% higher arrow speed
✅ Increased energy and flatter trajectory
✅ Let-off system reduces stress while cocked
✅ Modern compound shooting characteristics
✅ Adjustable draw weight from 99–130 lbs
✅ Official EK Archery upgrade solution  

⚠️ Designed for heavy ADDER TX bolts only

For more information, please visit the manufacturer website for this product .