The bottom line is this: The thread's premise is misleading and the crisis largely imaginary.
1. That the OP is female is irrelevant. Period.
2. The type of gun she wants to buy is irrelevant. Period.
3. As she was not denied, her premise - "can't buy a rifle" - is false. A delay is just that; a delay. After 3 days, if not denied, the transaction may proceed.
To the extent there is an ongoing problem, as opposed to a momentary glitch, a UPIN will solve it, as was already posted.
Let us hope her future purchases will proceed unimpeded.