I happened to stumble across this whilst on another forum. It's basically a game where you create your own weapons. Whoopee, right? You basically put a gun together with a bunch of pieces. Link
A 5.7, I made the barrel slightly bigger so as to put the suppressor on it. Also decided to try my hand at making it look like it's shooting, but I think I failed.
A modified TAR, this one has an oversized barrel and what is supposed to be an awkwardly placed carry handle. The aperture sights are flip-down, and the scope is supposed to be a flip-up, so you can easily switch from close to long-range fire. Oh, and it has a bipod.
My love of bullpups made me decide to make a bullpup sniper rifle. Even though I prefer bolt-action rifles for my snipers, I think this one turned out rather well.
I'll try to make a normal bolt-action, but this program doesn't seem too friendly with them, let alone a bullpup bolt-action like how I would want to create (there are some out there already).