[DesertRhino]

http://www.impactguns.com/mossberg-500-sp-12-gauge-adjustable-stock-wpistol-grip-185in-50474-015813504744.aspx

The US Marines are using the Mossberg 500.

[Tijeras_Slim]

The 500 is a fine gun, but you can do better.

The Marines also used the M50 Reising on Guadacanal... ;)