I just checked, it's a step file, not iges. It'll still import into CAD and CAM software. The file is for the entire bolt and carrier including all the parts. The step file is about 3.8 megs.
I'm not sure of the accuracy of the model since I got it from someone else. So it's a good idea to verify it with an actual part before using it.
Where would you like me to send them?