The XM8 is of modular construction and barrels of different lengths and weights can be interchanged to meet tactical needs, producing carbine, compact carbine, sharpshooter, and ?

• XM8属于模块化结构，其枪管有多种不同的长度和重量可供替换以适应战术要求，生产出卡宾枪，紧凑型卡宾枪，狙击枪，以及?