hatsan model 125 4 5 mmHatsan Model 125 air rifle in 4. 5 mm This air rifle is extremely hard shooting and has a muzzle velocity of 380 m s. Hatsan is known for making air rifles that are hard shooting and the Mod 125 is certainly no exception, as it has a muzzle velocity of a whopping 380 m s with ordinary shotgun pellets. Airguns have a nice synthetic stock with some cool and useful cutouts in both the forend and the grip of the airgun, this gives you a better grip on the