The latest update from FG Airsoft reveals new products they have developed that are specifically made for the GHK AK Gas Blowback Rifle. You can check these upgrade products such as the Steel Hop-Up Chamber, Steel Sear, Steel Sear Semi, and the Steel Outer Barrel. All are French-made and are CNC-machined with the last three being burnished whilst the hop-up chamber os manganese phosphated. Check the links to learn more.

Hopup steel chamber, CNC machined, manganese phosphated

Steel sear, CNC machined, burnished

Steel sear semi only, CNC machined, burnished

Outer barrel steel made, CNC machined, burnished