blow back force of gbb m4

gunsmith 士官帖子 110 積分 3815 Like 0 在線時間 402 小時註冊時間 11-10-2007 個人空間發短消息加為好友當前離線	1^# 大中小發表於 3-8-2010 03:46 顯示全部帖子 blow back force of gbb m4 do any c hing knows which brand of gbb m4 has the strongest blow back force ?? i only tried agm and we!! and now want to buy KA!!blow back bigger better than AGM???? thx
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