When you reach the house where the lab is, before you enter the gate doors walk along the front path.
Press the L1 near the end of it you will be looking at the floor, shoot exactly 100 grenade, flame, or acid bullets at the area.
After 100 bullets go inside the houses yard and go back out to the path.
You will see a secret staircase that will lead you to a room where you get an MP5A5 machine gun with infinate ammo.
When you take the door on the other side of the room and it will lead you into the lab.
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