Yep, then the MSM could demagogue those pictures for years.
But the important thing isn't for Bush to win.
The most important thing is that he whisper sweet nothings in your ear so you can feel good.
No such thing as of tomorrow, not in Texas anyway. The President could take his practice with an M-16 if he wants to, today, tomorrow, whenever. President Kennedy was filmed doing just that, from a boat, back when the M-16 was new. (It was probably a full auto AR-15 then, because it had not been type accepted by the Army as the M-16). But what you mean is full featured semi-auto version of an assault rifle (such as the M-16).
I'd be happy just to see him blasting away with a standard capacity magazine in a handgun.