I love it when a game developers put a tiny glitch so us who got no time for playing the game over and over again can get a certain features. Metal Gear Solid 4 is a sick game and I love playing it, by the way. But, here’s a tip for gathering those Drebin Points easily.
This is a sweet spot to collect those Drebin Point in Metal Gear Solid 4: Guns of Patriots. Get a Patriot gun by entering “pkhhnwhsjt” as your password (no quotes). And get your way to the 4th act. After you defeat Screaming Mantis you will run through the corridors and meet by those rolling robots. Stand by the end of the first door and turn around. You will notice the robot will keep respawning and you can just activate your Auto Aim and hold L1 and R1 buttons with a rubberband.