- Feb 4, 2013
- 28,175
MSP FLD told me unequivocally over the phone that anything not in 5.56/.223 is not a clone and GTG in an AR. I'm pretty cautious and I wouldn't hesitate to buy one if I wanted one. I'd be more scared of paying a dollar a round than anything, but that's just me.
Call back again, and you will get a different answer.
The law does not mention caliber for the AR (it does from some banned rifles, like the Mini 14 with folding stock).
But if you assume that 5.56 is the only one banned by name, a .300 BO meets the Copy test, based on the AG letter. You can swap any one part between a 5.56 AR and a .300 BO and both will still function. This is because the only difference is the barrel.
A .458 SOCOM would not meet this test, as the barrel AND bolt are different.