Internet Movie Firearms Database
http://www.imfdb.org/wiki/The_Avengers_%282012%29Also Thor
http://www.imfdb.org/wiki/ThorWhich identifies the gun Barton nearly uses as Remington 700PSS
which was pretty much what I thought after more poking around than I'd need if I remembered this site more.
SHIELD agents standard sidearm is a Smith & Wesson M&P , which is great for fics set since 2005, but before that it needs to be something else.
I've been on this site before for Stargate but forgot it for this. Well, I know a lot more about some sorts of guns from a couple of websites of unknown reliability. And since I knew nothing, a lot more is still not a lot, but, no knowledge is wasted.
(I have such a headache right now)
SHIELD Strike teams, and Ward and Coulson in some eps, use the M4A1. That redirects to M16s, which have been around plenty long enough for current purposes.
Sniper rifles, Remington Mk. 13 Mod 5 also comes up.
But Ward uses at least three different sniper rifles in season 1, and May gives Skye a different different one in season 2, so there's at least 5 sniper rifles
on the bus and I think it's safe to say that snipers are super picky. Meaning I can justify any choice of weapon as today's special best.
However what there
aren't are a whole hell of a lot of SHIELD specific weapons. Which makes sense, because they'd have to make them all. The ICER guns have apparently been props in another series, which in-universe could be fun xover times.
There are
some custom whatsits though, including in Coulson's possession, so if I want to say SHIELD did something up special, so it can be.
I don't have to though, for anything after 2005.
... my fic starts in the early/mid 90s and I now need to make a logical guess or find other data.
While all dates of US Army equipment are pretty easy to find, SHIELD uses
police weapons. 700PSS stands for Police Sharp Shooter. Same with their sidearms. Very similar, obviously, but there's a lot of different police and I can't find a site right now that lines them all up on a timeline.
Says something about the kind of org they think of SHIELD as being. Descended from the SSR and WWII it may be, but law enforcement it kind of sort of is.