Guns Specs?

When we say "gun specs" what will come immediately on your mind?

Is it the size, measurement? What? Specifically its the everything that contributes to the gun's technology and power.

Gun's technology and power...Every little thing that composes the whole gun itself is the gun's specs.

Now what is specs in general...Specification to others, well it is also right but the true meaning of specification is this "A specification is an explicit set of requirements to be satisfied by a material, product, or service." Thanks wiki.

Now when we say...32 caliber, 9mm, .38 caliber, 50 caliber. What is the number determining to?

It is not the bullet measurement but indeed its the whole of the barrel measured by its diameter.

Hope this can enlighten some people has this questions.