The old Kerstin locking system is extremely strong and allows for the low profile design of the SKB action. The lock up is obtained between two rear barrel extensions of the monoblock that engages two inlet slots in the receiver. In addition to the locking bolt, the monoblock has three additional locking & alignment lugs precisely machined for the added strength. The barrel group rotates on bifurcated lumps that engage trunions in the wall of the receiver. There is no denying the efficiency of the SKB design. A detachable trigger mechanism is used in all Premium grade competition models. The trigger group is retained by means of a large screw located behind the trigger guard. Four turns of a screwdriver or coin is all that is reqiored to release the unit. This is a much simpler and safer system than the complex catch mechanism. The detachable trigger mechanism is non-selective mechanical system. The hammers are powered by large V-shaped springs, which have faster lock time than coil springs. The trigger pull is very crisp and relatively light due to the straight sear let off. An adjustable trigger shoe is available on model 5000. The premium grade barrels are chromed lined and have ventilated side rib to dissipate heat more efficiently The flat top ventilated rib is 12mm wide the surface is machined with a 5- groove center channel and fitted with target sights. The gun is balanced at the hinge pin. so that the the weight is evenly distributed between both hands. This is the recipe for a low moment of inertia and smooth effortless handling. Although some others shotguns feel as though they are fighting back, SKB becomes a natural extension of the shooters arms and flows toward the target. The stock has been designed with a double palm swell and a pronounced pistol grip to give positive swing control. Fitted with 15mm rubber recoil pad, this insures a comfortable shooting even in the longest competitive events. The fine line diamond checkering is cut sharp to provide a positive grip in both hands.