This gun is the perfect zombie gun: continued operation like only Russians understand, very common ammunition, built in bayonet, ease of service, simplicity, acuracy, and a semi-automatic rate of fire. Aftermarket modifications are available for bullpupping and integration of Picatinny rails. However, a regular field strip is strongly recommanded. While early Soviet models of the SKS had spring-loaded firing pins, most variants have a free-floating firing pin within the bolt. Because of this design, care must be taken during cleaning, especially after long storage, to ensure that the firing pin does not stick in the forward position within the bolt. Some slam-fire issues (the gun firing in full-automatic after releasing the trigger after the first shot) can happen due to SKS firing pins that are stuck in the forward position. If the shooter isn't prepared, he could lost the control of the weapon and injure or kill an innocent.