I JUST PURCHASED AN M4 AND I WAS WONDERING IF ANYONE HAS THE SUREFIRE M80 OR THE SIDEARMOR SYSTEM ON THERE'S TO ATTACH A LIGHT.? HOW ABOUT THE GG&G SINGLE POINT SLING PIECE. WILL IT WORK WITH THE COLLAPSABLE M4 STOCK.? WHAT OTHER COOL GEAR IS AVAILABLE FOR MY M4.? THANKS FOR ANY SUGGESTIONS OR FEEDBACK.