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
物）必须拥有稳定的外形，比如带尾翼的箭状物或球体，以此减小发时的震
。
空腔辐
计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（抛物）必须拥有稳定的外形，比如带尾翼的箭状物或球体，以此减小发时的震。
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