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.
The word acronym fuses together two combining forms: acr-, meaning " beginning" and -onym, meaning " name" or " word" , both of which trace back to Greek.
，
如
尾
状物或球体，以此减小发射时
缩略词一词融合了两种组合形式：
思是“开始” 和-onym， 
以追溯到希腊语。
