Guarder Stainless Steel Cylinder Head for Ver.3 AUG Only SIG556 they have a thread cover

they have a thread cover instead which you can also remove

ambidextrous slide stop safeties

this GBB is made by metal

- Steel Body Receiver With Top Cover

1V Triplet Type Lithium Battery Magazine Capacity 380 Rounds Bullet Type 6mm BB Power (Muzzle Velocity) 440 FPS Package Includes King Arms VSS Vintorez AEG (Real Wood Version)

Guarder Stainless Steel Cylinder Head for Ver.3 AUG Only SIG556 they have a thread coverEssential part for upgrading your Airsoft Electric Gun AEG Double O Ring Design increase the air tightness of the cylinder This is highly recommended upgrade for AEG with lengthened barrel since you need additional volume of air to propel BB out of longer barrel Design for Tokyo Marui Original Specification As always, upgrading AEG require necessary skill & technique to dissemble the gearbox, consult expertise if needed SKU GE 04 12 Item Weight (gram)