Recently took a trip to Woolaroc museum and game preserve. https://www.woolaroc.org/visit-woolaroc It is between Bartlesville and Barnsdall and only about 50 miles from Claremore, home of the JM Davis gun museum. https://www.thegunmuseum.com
Woolaroc was very cool, the museum had lots of Western American history exhibits and wall mounts and full stuffed animals everywhere and lots of Oklahoma oil history as you would expect from Frank Phillips. And an entire room with an awesome Colt firearms collection. Here is just a few pics, I could have taken many more. If you are in the area, check it out.

Nice pics! (I'm assuming all the ammo in the belt-feds is dummy.)

flashguy

Most likely inert rounds flashguy. Ive had those 225 round belts of ammo. Also had many a thousand Browning links and some 100 round belts made up. Guy threw a box on the blacktop in front of me today at the Market. Had several new 225 round cloth belts still tie wrapped. Also about 5 sectional cleaning rods for the 50 M2. I got no use for them but someone may who shoots machine guns here in Kentucky. I was at Claremore, OK about 6 years back. Never knew there was a Museum there. Would enjoy seeing those Colts.

OP, that vertical standing gun in your 4th picture is a aircraft gun. You can see them dual mounted in the photo at the displays rear. That is a very old piece.