High-quality hop-up chamber for PKM, M43, M60 machine guns from Bull gear company. Made on CNC equipment. Allows you to rigidly fix the stem in the chamber and achieve precise alignment. The chamber is fully compatible with standard rubber bands.   

The rocker arm of the pressure roller is fixed on the screw. The rotary type roller allows for smooth and very precise adjustment.   

When installed in some models, an independent modification of the chamber may be required (fitting in place). For example, with M60 machine guns, it is necessary either to bore the inner diameter of the barrel, or to sharpen the chamber itself.