THIS IS MY DPMS AR-15 IT HAD A A2 UPPER RECEIVER BUT I PUT A A3 FLATTOP ON AND ADDED A EOTECH 512 AND YES YOU CAN STILL TURN IT ON AND OFF UP AND DOWN NO PROBLEM WITH THE EOTECH G23 3X MAGNIFIER WITH SAMSON FLIP TO SIDE MOUNT AND FLIP UP DPMS REAR SIGHT ALSO ADDED A VERTICAL GRIP \ FLASHLIGHT MOUNT FROM THE MAKO GROUP , HOGUE GRIP , MAGPUL PMAG , SUREFIRE G2 , UTG QUAD HAND GAURD AND NEXT ON THE LIST IS MAGPUL UBR STOCK , NEW TRIGGER AND GAS PISTON AND FLIP UP FRONT SIGHT SO STAY TUNED ALOT MORE FIREARMS TO COME ARMED LOCATION
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