Yugo SKS Battlerifle Variants. 1. Stock Yugo SKS rifle. 2. Modified Sawed off SKS "Pistol". 3. SKS Variant JBS-53 altered version of a SKS-D model (able to accept AK-47 mags). 4. SBM-25 Custom pistol caliber bullpup SKS platform based weapon, Caliber 7.62x25mm 5. KSS Modified Bullpup SKS w/ 20rd magazine. 6. SVS WWII Semi auto prototype rifle 7,62x54R (long action SKS) 7. Customized SKS for target shooting.