This is my a&k originally a pkm model but rebuild as a pkp with a raptor pkp parts kit. 
The replica includes:
- 1 original box mag with bull gear insert
- stichprofi with bull gear internals and quick connection 
- bull gear hop chamber 
- original barrel and stock 
- sputnik silencer 
- original gear box, novritsch M249 gearbox and a bull gear pkm gearbox 
Currently the original gear box functions with only 0.5 joule, since I do not play as much any more and do not have The time and or money to fix this I am selling this.