Building Fire WA M4A1 Magazine Valve Lock.
Constructed with steel.
Replace WA M4A1 Series Original Parts: Magazine Valve Lock (No.211).
As always, upgrading AEG require necessary skill & technique to dissemble the gearbox, consult expertise if needed.
Color - Black
Building Fire - Steel Magazine Valve Lock for WA M4 GBBRBF-EF-49