Interested in practical pistol shooting, airsoft or real steel? Here is a guide from the Surplus Store on race guns... "A race gun is a type of handgun, shotgun or rifle which has been modified to improve its accuracy, reliability and speed. These types of guns are primarily used in real steel practical shooting and similar competitions for the International Practical Shooting Confederation (IPSC). Race guns are based on common guns and modified to function at their best within certain requirements of weight, size and capacity. This article features mostly on the real steel side of competitive shooting, however, competitive airsoft shooting is becoming more popular - you can read about that further down in the article."

Read further here.