You're missing my point. MOST people can't ID a handgun and it's not that I find it suspicious that the girl couldn't ID the make.
I just find it strange to have "dark colored handgun" reported, instead of "handgun."...again, having seen or heard thousands of crime stories with a suspect at large who used a handgun, not a one said "dark colored handgun"...it was always "handgun" if there were no specifics on the gun reported.
It's not strange. Put yourself in the cop's place. The girl says she saw a gun.
Q: "Can you describe the gun?"
A: "Well.... I don't know how to describe it."
Q: "What color was the gun?" A: "It was dark-colored..."
Q: "OK. Can you tell me how big it was? Was it bigger or smaller than my pistol?" A: "It looked smaller...."
And then the cop releases the information as part of the description. You never know what will help.