三發點放






只有三發點放及單發的M16A2。





SIG SG 550使用槍身上的選擇紐可調整為三發點放模式


三發點放（3-round burst，burst），或稱“三連發”或“三发短点”，是槍械術語。在越戰之前，美軍的步槍只能選擇扣下扳機後子彈是單發或連發；然而越戰時在叢林內的遭遇戰都極短暫，很難單發命中靈活穿梭於林間的越共，而連發又過於耗用子彈，而且很多新兵也因為緊張而濫射子彈，導致重新裝填彈匣的動作過於頻繁而向敵人露出破綻而死亡。因此越戰後的美國軍方在M16A2上設計了只能單發及三發點放的快慢機，以在節省彈藥、準確度、步槍功能定位和火力密度之間做出一個平衡。M16A2的點射機構有設計缺陷：扳機組件在扳機被釋放之後不會自動複位。舉例來說，當一個士兵在點射時第二發和第三發之間就已經鬆開了扳機，那麼下一次他再扣動扳機的時候只能射出一發子彈；即使在半自動模式中，扳機組件的機制也會影響武器的使用每一發子彈被射出之後，扳機組件都會在點射模式的3級之間位置不同；在這些級數之間每一次扣動扳機力度都不太一樣，從而影響單發射擊精確度。當時也採相同機制的HK G41，因結構上的差異則無此問題。


俄羅斯的AN-94有獨特的「兩發點放」模式，該模式的射速高達每分鐘1,800發，以增強子彈的穿甲能力。另外H&K也為其推出的一些槍械（如：MP5、G36、G3等）提供具兩發點放選項的快慢機組。AK-12的最新型號也能夠兩發點放。


現在，大多數突擊步槍都具有全自動及單發，三發點放變為非主要射擊模式，不過也有一些現代步槍同時擁有全自動、三發點放、單發射擊模式。（如豐和89式突擊步槍和T91戰鬥步槍）



參考



  • M16突擊步槍

  • CAR-15卡賓槍

  • 貝瑞塔93R手槍




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