The Meaning of 18 U.S.C. 921(a)(17)(C)
When you can't change the law, change the definition of the words...
The BATFE is now trying to say that the .223/5.56 is an "armor piercing" round, with no "sporting" purpose. Where I come from, competition is considered "sport." Organized rifle and pistol matches are considered "sporting events", and .223 is widely used in competition.
If this kind of nonsense is allowed to go on, for the first time in the history of this nation, (law-abiding) American citizens would be prohibited from practicing with their nation's service rifle.
/fl