The frame is a single piece of aluminium alloy, giving high strength. The barrel is high-grade steel, and all external surfaces have an anti-corrosion and anti-glare finish. The breech mechanism employs a rotating bolt for additional security, and it is possible to launch grenades from the muzzle. The weapon feeds from a removable box magazine. A grip safety device prevents the weapon from being fired unless properly handled.The B4 shotgun can be operated as a self-loading weapon or manually as a pump-action gun, the choice being selected by a lever. The action is gas-operated in the self-loading mode. The shotgun can fire all normal plastic and brass-cased shotgun ammunition.The B4/B model is derived from the B4 but dispenses with the self-loading action and is pump-action only. Its dimensions are the same as those of the B4 except that it weighs 450 g less.
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