ISO 556 Enhanced Valve Knocker

One single piece can completely change the Maruyama ISO 556

In Short

In collaboration with Cheffington, an experienced airsoft technician, we are proud to share with you the Enhanced Valve Knocker for the Maruyama ISO 556!

This part replaces the valve knocker in the lower receiver of the Maruyama ISO 556. It opens the valve on your gas magazine fully, which results in a much more exciting shooting experience (a sharper action with consistent full auto mag dumps, unlike the stock configuration). Say goodbye to gas clouds during rapid firing.  

The Problem

A big issue a lot of people encounter with the ISO 556 is that it can feel a bit limp with its blowback, especially in winter. There are a good few owners who brute force past this with a stronger gas but for others it put them off the platform entirely... But not Cheffington. 

After looking at the lower receiver and its components, he quickly realized that the issue was how much the valve on the magazine was held open during firing. It was less than other GBBRs.

The Solution

By simply just making the valve knocker in the lower receiver of the ISO 556 just a few millimeters longer you can increase the distance the magazine valve is open for during firing, which in turn gives a far more complete recoil experience. Simply; A much more enthusiastic GBBR experience with a lot more consistency on full auto. 

Myself and Cheffington then began manufacturing which brings us to today; a CNC machined and polished steel, coated in our signature finish to aid durability and to reduce friction.