BB guns may be used for utilizing for any kind of operating mechanism adopted in air guns. However owing to limited range and accuracy inherent within the gun, only less expensive and simple type of mechanisms is utilized generally.
As because almost all type of BBs being used today is made of steel, it is natural to find BB guns in the market which utilize magnets for their loading methods. As because it is very difficult to swag a gun to make it bore size, magnets are utilized for holding the barrel from its rear position or on the other hand, the BB will come out from the barrel it is gripped in downward angle. Spring piston is the traditional type and very common power plant in respect of BB guns, generally designed like a shotgun or a rifle. The rifle having liver action was the first model of gun, and still now is very popular in the inexpensive gun market for the youth. Model 25 BB gun of Daisy, was designed for making pumping action shotgun having mechanism of trombone pumping action, which dominated the less price, for more than fifty years having higher market performance.
Velocities for models for liver action are generally very low because of weak springs make cocking efforts lower for the use of youth. 25 BB gun of Daisy model, incidentally, recorded the highest velocities during its time which ranges from 375 feet per shot from 450 feet per shot. Guns of liver action are very often found to have large capacities for ammunition, and one early model of liver action from Daisy accommodated 1000 BBs in comparison to model 25 of Daisy which accommodates only 50 BBs.
In the liver action BB guns, the ammunition is fade with gravity, and it happens in such a manner that the gun must be gripped in a proper angle when being ready for loading ammunition. But in case of model 25 of Daisy, the ammunition, on the contrary, is loaded with spring and not shifting nature of gun angle is necessary for reloading of another BB. There is also another common type of guns which are called multi-pump pneumatic guns and many pneumatic pellet guns meant for the youth give the scope to utilize BBs as alternative option of cheaper type for lead shot. These guns are made of rifled barrel and for that reason rifling cannot give a significant nature of spin.