FMJ (Full Metal Jacket) is a gun attachment in Modern Warfare 2. FMJ is awarded upon completion of Marksman V, which requires 300 kills. Contrary to popular belief, FMJ does NOT increase the damage of a gun in open combat (despite what the stat bars may say), but it does help kill quicker through walls (similar to Deep Impact from the first Modern Warfare.
40 bullet penetration kills unlock Extended Magazines, which allow more bullets to be carried in a single mag. These can be achieved by shooting through windows or chainlinked fences. Only one bullet needs to hit the target via penetation for it to count as a BP kill
When someone goes behind a wall, be sure to shoot them through it rather than wait for them to come out of cover
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