Quote History Quoted:
Was the real military issued Mossberg a 8/9 shot? Rifle sights or bead?
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Yes.
What you're referring to is known as the "Type I configuration" in the actual
MIL-SPEC, which is referenced in the thread below. Word is there were only about 1,000 of them.
Someone here has a pic of a graduating class of Marine Security Guards and they're all armed with Type I Mossberg 590A1s with bead sights. The pic was taken sometime from the late 1980s to mid-1990s and they were all in woodland BDUs.
My understanding is that the DOD originally acquired the 590A1 in Type I configuration for Marines and Army Special Forces, but it's rare to see pics of them in service from back then.
Obviously during GWOT they acquired a majority not in type I config.
All branches (except maybe Army?) had old 7-shot Remington 870 shotguns with bayonet lugs dating from Vietnam to about 10 years afterward, and sometimes those were seen in
photos of Marine MEU(SOC), Recon, or FAST units. I've never seen one of a SEAL with the bayonet lug variant after Vietnam, but I know SEALs continued to use 870s in various configurations. I believe the 590A1 was acquired to replace those old Remingtons (at least in the USMC). SWCC units got some of the 17" 500/590 (removable mag tube cap) like the rest of the US Navy, but I cannot advise when that happened.
Edit: Here we go, 1994
Attached FileFrom this thread:
https://www.ar15.com/forums/general/Badass-surplus-870-shotgun-Discussion-thread-keep-WTT-WTB-WTS-in-the-EE/5-2156675/&page=70