This is a factual question on a gun appearing at the end of the movie, “In The Line of Fire”. What kind of gun was used? (Gee…that shouldn’t spoil too much.)
You mean the one Malkovich made himself out of plastic?
Could be…
You mean the one Malkovich made himself out of plastic? I guess so. The plot seemed so contrived, I only needed to see 10 minutes to get the gist from the recent TV airing on TVLand. But, no need to debate here…
It was a .32 caliber Malkovich 
A hand-made zip gun wiki