The ACR "rifles" used smoothbore barrels to fire single or multiple flechette per round, rather than bullets, to provide long range, flat trajectory, and armor piercing abilities.
炮弹（抛射物）必须拥有稳定
外形，比如带尾翼箭状物或球体，以此减小发射时震动。
The ACR "rifles" used smoothbore barrels to fire single or multiple flechette per round, rather than bullets, to provide long range, flat trajectory, and armor piercing abilities.
炮弹（抛射物）必须拥有稳定外形，比如带尾翼箭状物或球体，以此减小发射时震动。
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