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The Zastava M21 is a series of 5.56×45mm NATO firearms developed and manufactured by Zastava Arms.〔(【引用サイトリンク】title=Assault Rifle M21 A )〕 ==Overview== The M21 is based on the AK-47 Kalashnikov principle, chambered in the 5.56×45mm NATO cartridge.〔(【引用サイトリンク】title=Welcome to Zastava-arms - Zastava-arms )〕 The current models use a 1.5mm thick stamped receiver, while a future model will feature an improved receiver of 0.9mm thickness to achieve a considerably lighter weight. Like many modern assault rifles, the M21 can incorporate picatinny rails for mounting accessories like optics, vertical grips, bipods, etc. The Zastava M21 is gas operated with a rotating bolt locking system.〔 It features a hard chromium-plated, cold forged standard rifled or an optional polygonal rifled barrel, integrated 22mm flash hider grenade launcher, rigid polymer folding stock, heavy-duty synthetic handguard with an additional left hand side fire selector, cover mounted picatinny rail for optical sights. The rifle can also mount a 40mm under-barrel grenade launcher.〔 It has a magazine capacity of 30 rounds. The cyclic rate of fire is 680 rounds per minute, and the sustained rate of fire is 120 rounds/min.〔 Barrels *conventional barrel (Zastava M21) *polygonal barrel (Zastava M21B) The regular barrel has six grooves with a right-hand twist. An octagonal polygonal version is also available and has four grooves with a right-hand twist (M21B). Barrels are also hard chrome plated to provide a longer service life. The rifle has conventional iron sights that consist of a front post and a flip-up rear sight with 300m and 500m apertures. A set of picatinny rails on the hand guard can mount various optoelectronic devices. The M21 is a modular weapon, with configuration dependent on the task and mission. Optical sights: *ON M04 "TELEOPTIK and *ON M04A "ZRAK" Optoelectronic devices: *Reflex sight, M04 "MARS" *Bookmark target laser M04A-AIM2000 *Passive monocular M04 MINI N/SEAS *Passive sight PN 3x50 "SOVA" *Bookmark laser target M04 "INFIZ" *Passive monocular MINI N/SEAS combined with reflex sight M04 "MARS" 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Zastava M21」の詳細全文を読む スポンサード リンク
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