Guarder 1st Steel Hop-Up Kit for KSC/KWA MAGPUL M4/LM4 GBB Rifle
Steel/ Plastic/ Cooper/ Rubber Construction
Hopup Gel made by 70° Silicone Gel
Steel Hopup Round
For KSC M4A1 & KWA MAGPUL GBB 1st Version
2nd Version Must Change the inner Barrel, You can Choice Guarder Inner Barrel Series: GUARDER TN-21、TN-22、TN-23、TN-24
As always, upgrading AEG require necessary skill & technique to dissemble the gearbox, consult expertise if needed
