Not sure where you're going with this. The lightning link makes an AR15 functionally equivalent to an M16; it requires no modification to the lower; and it's no

Not sure where you're going with this. The lightning link makes an AR15 functionally equivalent to an M16; it requires no modification to the lower; and it's no more or less safe than a "Connecticut M16" (M16 with safe-auto-auto selector). Illegal, yes, if you aren't an SOT or aren't using a registered lightning link.i