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.
有
定的外形，比如
尾翼的箭状物
，以此减小发射时的震动。
词融合了两种组合形式：acr-，
思是“开始” 和-onym， 
” 
“
词”，两者都可以追溯到希腊语。
