In the late 1980's (or thereabouts), the military picked the Mossberg 590 for it's new pump shotgun. This weapon met the requirements of MIL-S-3443E for shotguns. Evidently shotguns like the Remington 870 and Winchester Defender were not considered because they lacked an ambidextrous safety. Does anyone know what other shotguns were in the running for this contract? If the safety wasn't an issue, would (just wondering) the M590 still have been selected over the 870 or Defender?