lol Funny thread. MP5 - no stopping power, might as well use an M4 (see Avatar, yes, that is in a country that is currently at war) or an HK MP7 (4.6mm, massive stopping power for a tiny round). Weapons of choice - M4A2 (custom Knights package, shortened barrel, 40-round mags, EOTECH or Trijicon sights, if maintained properly, you will never have a stoppage), AK47 (a beast but with full American mods) as primaries. Secondary is any type of Glock, Walther P99, or a Sig Sauer 226 (HK also makes some nice .40 / .45 pistols). Tertiary (in pack) Glock 26. Long range - TAC .50 (anti-material), Bushmaster SR-25 (built as a Knights package, Leupold sights, suppressed), M14 (believe it or not, one of the most accurate weapons ever built). Shotgun - as the man mentioned above, nothing beats a Benelli M2.
If you ever wanna know the best things that go 'boom,' let me know.
