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柯尔特公司于2014年推出了AR15A4半自动步枪和LT6720MP警用卡宾枪,这两款新枪都是发射5.56mm北约制式枪弹。另外,柯尔特公司还推出了MARC901系列卡宾枪,其发射7.62mm北约制式枪弹。两种不同口径的卡宾枪满足不同的战术需求。不过,最近出现的0.300英寸AAC枪弹开始被广为认同,这款枪弹拥有比5.56mm北约制式枪弹更好的穿透力,而比7.62mm北约制式枪弹体积小,后
Colt introduced the AR15A4 semi-automatic rifle and the LT6720MP police carbine in 2014, both firing 5.56mm NATO bullets. In addition, Colt also introduced the MARC901 series of carbine firing 7.62mm NATO bullets. Two different caliber carbines to meet different tactical needs. However, the recent 0.300-inch AAC cartridge was widely recognized as having a better penetration than the 5.56mm NATO cartridge and smaller than the 7.62mm NATO cartridge