Here some replacement and upgrade part for KSC M4A1 Gas Blow Back Rifle
- Steel complete bolt Set, by KSC
- KSC 40rds Magazine, by KSC
- RA TECH Precision 6.01 Inner Barrel for KSC M4A1, by Ra Tech
- KM 6.04mm Inner Barrel For KSC M4A1, by KM
- RA Tech Plastic Nozzle with N.P.A.S. Adjust Tool Set, by Ra Tech
- Lower Receiver, made by alumunium, by KSC (no marking)
- KM High Flow Valve for KSC M4A1
- ESD KSC M4A1 Gas Blow Back Valve Bush
- KM M4 SUS Steel Trigger Set for KSC M4
