This product from MadBull Airsoft is getting good reception... "The version 2 ball bearing spring guide features a slightly thinner diameter shaft to accommodate springs of all sorts, making it more forgiving for both the spring and piston to compress. The spring guide's shaft is built-in with the top bearing plate to allow more rigidity and maximum spring decompression. As a spring decompresses, the bearings allow full twisting, adding improved rounds-per-second and maximum power.

"Unquestionably the most unique and innovative spring guide on the market today."
- Fox Airsoft Blog

"A a necessity for anyone looking to upgrade their AEG"
- Bored Gunner Blog

"The next time you change your spring guide, ask for a better one – Madbull Ultimate Spring Guide"
- Section 8 PMC Note: Review is in Polish with English translation

Features:

• Thinner guide shaft for easy, stress-fee spring compression
• One piece bearing top plate and guide shaft.
• Loose bearings for maximum spring twisting.
• Smooth anodized finish.
• Machined lightweight CNC aluminum.

The Madbull Ultimate Spring Guide for Gearbox Versions 2/3 is available at your local Airsoft retailer."