Skin Penetration & Ballistic Gel Test with some Airsoft Replica Guns

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Ballistics gel test for determining depth of penetration with various airsoft replicas.
Shooting distance: 3 meters (10 ft) & 5 meters (16.4 ft);
BB Used: 6 mm caliber and weight of 0.20 g to 0.32 g.
Variable depth of penetration for powerful airsoft replicas: 4 cm. to 6 cm. (1.57 - 2.36 inches).

Experiments on bullets allow to estimate the minimum velocity for a airsoft pellet to penetrate in skin (where penetration means that the spherical pellet enters more than half in the skin). In 1978, it was measured that the critical velocity to skin penetration.... This means that a typical 0.2g airsoft pellet will penetrate skin at 136.7 metres per second (448 ft/s), or 1.87 Joules.
At a power of 2 joules and using balls of 0.32 grams, human skin penetration is provided at a speed of 112 m / s.
Should note that these data are calculated from the energy and speed provided the ball out of the barrel. As we know, these values decrease with distance, so a replica that develops 3 to 3.2 joules initially will provide skin penetration of 0.20 grams ball for distances between 5 and 7.5 meters, to the point where the energy value decreases to about 2 Joules. We can thus determine the minimum safe distance as 10 meters for such replicas.