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.
（抛
物）必须拥有稳定
外形，比如
尾翼
了两种组
思
“开始” 和-onym， 
” 或“单词”，两者都可以追溯到希腊语。
