An Armat Battlefield Systems Shotgun utilized by USCM Marines. This weapon is powerful in close quarters combat and is capable of killing even the strongest of hostile targets. Due to its sheer power, the M37A2 is capable of stunning even the mighty Alien when fired from close range, but users should still keep in mind that the M37A2 must be pumped after every shot. There is no default hotkey for pumping the shotgun, though you can set up one as a Macro.