garykcchan23

( GBB 用既瞄具係咪一定要用真品?
用copy係咪會震到成日要重新歸零? )

You can use ( copy M4S, M2 old ver. and Eotec 551 ),
those im using on my Ino. M4 GBB with out any problem....
especially the china made M4S is the best...