Yes. I just watched it in 3-D, and was cracking up at that.
They are not his boots and helmet. When a soldier dies, his helmet, boots and tags are put on his gun for a memorial for that soldier
An obscure invention by a man named Alberto Salardi. It was a submachine gun mounted to a helmet and activated by biting a small bulb. It was patented, but never saw production.
You don't. Won't fit.
It is the end of the stock as opposed to the end of the barrel end of the gun
The butt
Goose
A heat gun - alternatively, park the vehicle so the sticker faces the sun and you can peel it off carefully.
Slider.
It is called the "butt stock".
Pistol whipped
It's at the end of the barrel where the bullet comes out. It's at the opposite end of the butt of the gun.
Slider was Ice mans RIO