[Non-Sequitur]

So will it be the job of the state to ensure none of their domestically manufactured firearms leave the state? How will they do that?

[Sasparilla]

“So will it be the job of the state to ensure none of their domestically manufactured firearms leave the state? How will they do that?”

Nope, its up to the individual to keep the products in the state of Montana. Venture outside the state with them and you are Fed bait.

[Still Thinking]

So will it be the job of the state to ensure none of their domestically manufactured firearms leave the state? How will they do that?

Not at all. The law simply says "Montana citizen, IF you keep a Montana made weapon in state, the following federal infringements do not apply to you....". Obviously if a person takes such a weapon out of state, whatever happens is beyond the scope of this law.