Marui M870 forend tube is bigger than the other brands around 4mm and also a bit shorter (that's the Marui unique design), as of I compared the g&p tactical LED forearms one. That means if you want to install this g&p one on APS cam870, you may have to shim and lengthen(inside tube,not overall length) to fit properly. I'll take a deep look on it when I have time to disassembled the m870 or after I received the breacher. If you check the diagrams I posted for Marui shotgun, both of the forend tube and latches are even different design in length tho..
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Last edited by N_Force; November 2nd, 2014 at 14:49..
Reason: correct infos
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