An Airsoft gun UTG is guaranteed to be a powerful, realistic feeling weapon. They are for the serious collectors and serious war gamers. They tend to be heavier than the average gas guns, but the extra weight brings advantages. Typically, UTG guns are more powerful, have a higher clip capacity and fire faster. Another advantage is that, as collector's items, UTG guns have a higher resale value than most Airsoft guns. One reason for their higher value is that the realistic feel of the guns is matched by their realistic looks to army products.

UTG (Under the Gun) Airsoft guns are full sized, full weight gaming machines. Many of them are based on the more expensive guns from the Japanese Tokyo based company Marui. One example of such a gun is the Airsoft UTG MP5 A5 / A4 NAVY SEAL version 2.0. This gun is virtual carbon copy of the Marui version of the same gun, but it is much cheaper. Its three hundred feet per second (fps) muzzle velocity makes it powerful enough to pack quite a punch and its ability to switch between semi-automatic and automatic modes makes it like two weapons in one.

Airsoft UTG guns come in spring, electric and gas guns, so there is still a wide selection in the UTG line. AS UTG Guns can be pistols, machine guns, sub-machine guns, rifles and shotguns. In other words, deciding to get Airsoft guns from the Under the Ground line does not limit weapon selection.