That's the link to a vid that includes the gun. I find this video much more informative than the firing video. By the way, the gun is only in a part of the video, so don't bother watching the entire thing.
I would just forget the pennies and put an air restrictor behind the spring. This works just as well if not better
Would the air resrictor keep it from catching? I don't know it just seems too thick. Also the penny doesn't seem like you would get any significant change in the ranges.
The catch still works fine in my maverick. The ranges increased a bit, so I'd reccomendend it if you have a mav ar layin around.