I am still a bit obsessed with this topic and have been doing some digging. Last weekend I went through the entire movie and tried to get a screen shot of every pulse rifle to appear on screen where an identifying detail might be visible. My method is very inexact (taking pictures of the screen with my phone) so please forgive the crudeness and lack of photo quality.
So first up, details on
The "Rubber Stunts" = Could be anywhere from 7 to 11 of these. We need to figure exact number of firing heroes to determine this.
-The easiest way to identify a rubber stunt is the ‘forward barrel vent’ discussed earlier.
-Also mentioned earlier, if you can see the stock on a 'rubber stunt', you will notice it has a rectangular look as opposed to the "C" channel appearance which the steel ones are made of.
-The rear underside also appears as if the shrouds wrap all the way around it behind the grip. The shroud is clearly not two halves around the thompson as it is molded and painted as a single unit (hard to describe, hopefully images make this idea more clear)
-They also have a different mag base shape. Again, it is hard to describe so hopefully the pics will convey what I am saying. The contours of the shroud itself are carried through the mag base a bit more on the stunts. It is a more complex shape with more sides.
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It goes without saying, but the stunts were used in numerous background shots and used extensively when "multi-tasking" was required. Most every character has one eventually and they are particularly noticeable when the character is also carrying a flashlight or motion tracker in the other hand. (or has a flamethrower duct taped to it)
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The "Forward Hero"Now this, is what I thought the fun and interesting part was. Why did they mold the stunts 'wrong'? That forward barrel sticks out like a sore thumb. My guess is the very first rifle off the assembly line was the one molded so that they would be ready, and there IS a steel vented rifle that has the 'wrong' placement.
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Now the "forward Hero" is never actually seen firing. Since it appears to have been hastily slapped together for molding, it may not actually be a live fire rifle. BUT, it does have steel parts as you can see in those pics, you can see through the vent unlike the other clearly molded examples.
So I'm going to call that the "Forward Hero" for now.