Switching between the various options requires merely removal of a bolt at the rear of the receiver and swapping in the stock of choice. Sights The rifle's iron sights consist of a fully adjustable front post and a tangent rear sight with a sliding notch with range denominations from 100 to 800 m, graduated every 100 m. Besides this, the left side of the rear sight leaf is marked with the letter "U" (univerzální meaning "universal"), for snap shooting, firing at moving targets and night combat at ranges up to 300 m. The rifle's sight radius is . The front sight base also serves as a mounting platform for the vz. 58 edged bayonet. Accessories Several modernization accessories have been manufactured for the vz. 58 platform from different companies. Accessories include "tactical" bolt release, extended and/or ambidextrous magazine release paddles, ambidextrous fire mode selectors, custom handguard rails, several types of sight mounting options and various muzzle brakes and compensators. Both civilian and military users use these upgrades, and they also see frequent use with private military companies in the Middle East. Additional equipment supplied with the rifle includes: 4 spare magazines, a magazine pouch (in either canvas, leather, or leatherette), vz. 58 bayonet and scabbard, cleaning brush and rod, muzzle cap, oil bottle, unified sling, front sight adjustment tool, disassembly aid and a threaded blank-firing adaptor. The vz. 58 also has a proprietary bipod, flash hider and scope mount for NSP-2 night vision scope (vz.58 Pi variant). Grenade launching inserts, as well as under barrel grenade launchers were developed but never adopted. Variants vz. 58 P: Standard fixed stock (casually called "pádlo" (paddle) by Czech soldiers) vz. 58 V: Metal folding stock version for vehicle crew and airborne units. (casually called "kosa" (scythe) by Czech soldiers) vz. 58 Pi: Has a mounting interface for an infrared night vision NSP-2 sight, fixed stock, cone flash hider and folding bipod. Automatická puška ("automatic rifle") AP-Z 67: Experimental 7.62×51mm NATO caliber version developed in 1966. Útočná puška ("assault rifle") ÚP-Z 70: Experimental 5.56×45mm NATO version developed in 1970. Experimentální zbraň ("experimental weapon") EZ-B: Experimental bullpup prototype developed in 1976. Ruční kulomet ("light machine gun") codename KLEČ ("Mountain Pine"): Experimental variant with a 590 mm barrel (similar to RPK), developed in 1976. Lehká odstřelovačská puška ("light sniper rifle") vz. 58/97: Experimental marksman rifle developed by VTÚVM Slavičín. Samopal ("submachine gun") vz. 58/98 "Bulldog": 9×19mm