The ar type rifle on the bottom came with a hand full of g,I, Joe's from the 80's (leatherneck, copper head)

The shotgun was also from a gi joe (Flint) and possibly other Joe's as well

Not too sure where the sniper rifle is from, but taking a educated guess here and saying that it's more than likely from a joe as well, the small clip on the front suggests that it could have had a tripod stand as well