just remove the optic thats on it, and get a king arms optic rail. (you will need to remove some material from the rail for it to sit properly as the screws do not line up properly).
thats what i did on mine
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current armament: mk43, ump.45, p90, barret, m14, g33, k98, m4 tac, m4 swat, mp5 navy, vsr10, p226, m9.
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