Bullgear Hop-Up Classic Army Stoner LMG Hop-Up.

1) Rigid Chamber fixing.

 

2) Ability to use standard rubber and rollers.

 

3) Smooth adjustment.

 

4) All metal parts are manufactured by CNC processing.

 

5) Aluminium Construction.

 

6) Manufacturing method: CNC 100%

 

PS: It is recommended to use Prometheus Hop Rubber.