Hephaestus Airsoft just released an enhanced version of their Hephaestus Full Steel Simulated Recoil Spring Assembly for GHK AK Series. The first version was released in 2013 and this new version promises increased kick and better shooting experience with the GHK AK Gas Blowback Series:

• Stainless steel Recoil Spring Guide and Spring Cap.
• Steel Retainer with abrasion-resistant QPQ finishing.
• Equipped with 110% Recoil Spring for sharp recoil.
• Increase kick and enhance shooting experience.
• Evolved design for smooth operation and easy installation.