Here's my favorite screen used piece.
I was friends with Dr. Ray Giron for many years. He was a Civil War re-enactor, a teacher, and a good friend. I myself am a Medieval and Renaissance re-enactor, and we had deep conversations many times about the various wars, the reasons for the fights, tactics, etc. etc. He had a shop where he sold period uniforms (not just the Civil War, also every war from Vietnam on back to the Revolutionary), along with swords, belts, pouches, and just about anything you can imagine.
When he passed, I was given his stunt musket that he carried in the movie Gettysburg. It was cast in hard rubber, with some great paint work. It's said that he also used it for several other movies that he worked on. He founded the "Battle of Olustee" annual re-enactment, and attended all others that he could.
Ray was one of those guys that you really looked forward to meeting for lunch, or a picking trip, or just sitting at a campfire shooting the breeze. I miss him to this day. Here are some pictures, and a bit of history about him:
"General" Ray Giron
If you watch "The making of Gettysburg" on youtube, he's in a short clip near the middle.
I found an awesome thread by a crewman on the film "Glory", where Ray is mentioned. The poster (OP) worked on the film (as did Ray, as a prop master and Civil War consultant), and has posted some fantastic "behind the scenes" stories and pictures. He talks about working with Matthew Broderick, Morgan Freeman, Cary Elwes, Denzel Washington, Andre Braugher, and more. It's a great read, you should check it out: