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）必须拥有稳定的外形，比如带尾翼的箭状物或球
，
减小发射时的震
。
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）必须拥有稳定的外形，比如带尾翼的箭状物或球，减小发射时的震。
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