5.56mmM855枪弹在枪管长508mm的M16A2/M16A4步枪上发射时,在200m处仍然有相当高的存速,但当M855弹从368mm枪管的卡宾枪上发射时,由于初速降低,在100m处的存速便大为降低。但美军多年来早已习惯了采用更短更轻的M4卡宾枪,特种部队和轻步兵尤甚。那么,如何提高M4卡宾枪的远射性能,是美军面临的一个问 When a 5.56mm M855 cartridge was launched on a M16A2 / M16A4 rifle with a barrel length of 508mm, there was still a relatively high rate of stockpile at 200m, but when the M855 was fired from a 368mm barrel carbine, the initial velocity decreased at 100m Save speed will be greatly reduced. However, the U.S. military has long accustomed to adopting shorter and lighter M4 carbines, especially for special forces and light infantry. So, how to improve the long-range performance of the M4 carbine is a question the U.S. military is facing