STK-54: Difference between revisions
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The STK-54 (7.62x51mm) was manufactured under license by Defense Interprise "Kommunardi" for use by the Sarvian military.
== Design details ==
=== Operating mechanism ===
The STK-54 series of rifles are selective fire weapons operated by a gas-driven piston system similar to the one seen on the Volkian AR system. It uses ignited powder gases channeled through a vent in the barrel to drive a long stroke piston located above the barrel in a gas cylinder to provide power to the operating system. When fired, a portion of the propellant gases are evacuated into the gas cylinder through a 1.9 mm (0.08 in) port, drilled at a 30° angle in the barrel, and a channel in the gas block. The high-pressure gases drive the piston rod (which is attached to the bolt carrier) rearward. During this rearward movement, a cam slot machined into the bolt carrier engages a cam pin on the bolt and rotates the bolt, unlocking the action. The arrangement of parts on the bolt carrier assembly provides for a degree of free travel, allowing gas pressure in the barrel to drop to a safe level before unlocking. The weapon features a self-regulating gas system and a rotary bolt breech locking mechanism (equipped with two locking lugs), which is rotated by a helical camming groove machined into the bolt carrier that engages a control pin on the bolt. To the immediate rear of the chrome-plated piston head is a notched ring which provides a reduced bearing surface and alleviates excess gas build-up. As the bolt carrier travels back, it compresses the return spring guided in a hollowed section of the bolt carrier and the return energy contained in the spring drives the moving assembly back forward, stripping a new round from the box magazine and locking the action. The cocking handle is attached to the bolt carrier on the right side of the receiver and reciprocates with each shot; the handle is bent upwards allowing for operation with the left hand while the shooting hand remains on the pistol grip.
=== '''Sights''' ===
All variants of the STK-54 are equipped with an drum aperture sight adjustable from 100m to 600m increments. The front post is fully adjustable for both windage and elevation zero and is enclosed in a protective hood. Low-light flip-up front blade and rear sight elements have three self-luminous tritium capsules (betalights) which are calibrated for 100 m when deployed.
Accessories
A number of accessories were provided with the STK-54 in the Mirhaimian Realm Defence Forces as standard issued. These include a blank firing device, a standard model M55 No. 5 Bayonet, a web magazine carrier, as well as a foldable bipod which is attached to the bayonet sheath when in transport. All variants of the STK-54 has a foldable carrying handle built into the upper receiver of the rifle.
{{DEFAULTSORT:STK-54}}
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