A few thoughts on this:
1) The "live fire" of the P-40 is not something new. It has done it a few times before in New Zealand, but the big difference is that it is firing .50 caliber blanks.
https://www.youtube.com/results?search_ ... +live+fireIf you notice in watching some of those videos, the spent casings are ejected from the aircraft and free fall down to the ground. Something I will talk about later.
2) There have been at least 3 different attempts in recent times to fire real life (not blank) rounds from a W.W. II aircraft here in the U.S.:
a) Mike Dillon, because of his government contract work, was supposedly going to put .6 working .50 cals on a Mustang and fire them in the air in a military weapons range. He supposedly had everything o.k.'d by the government.
b) Glacier Girl, before she got sold, was going to be restored with its operable 20 mm Cannon and do a test firing on an Air Force range (Edwards, perhaps?) IIRC, Skip Holm was supposed to do the duties.
c) Reality show, "Sons of Guns" about Red Jacket Firearms, had a plan to do a show with outfitting a W.W.II aircraft with live machine guns and firing them. After the owner found out that "Twilight Tear" had already accomplished that, he abandoned the plans to do so.
None of these 3 plans above ever came to fruition, as far as I know. Even with all of this, the Collings foundation does "live .50 cal blank firing" from the waist guns on both their B-17 and B-24 only one time a year - at the annual Bomber Camp. Do a search here in this forum, there are plenty of threads about it.
3) So why hasn't anybody done it in the U.S.? Good question. It CAN be done successfully, but just requires a lot of paperwork, legal wrangling and a whole lot of money:
a) For starters, getting 6 operable .50 cal M2 machine guns is not going to be cheap. A few years back when last I checked, the going price was about 25K-30K per gun. So, right now, before anything has even started, we're already $180,000 in the hole.
b) On top of that one must clear all ATF and bureaucratic restrictions. Again, possible, but a lot of work. The guns will also have to be modified so they can only fire blanks. Real, honest to goodness, live fire (no blank) .50's will never, ever be allowed to fly on a W.W.II aircraft, UNLESS, you happen to be working on a government contract, in which case you are considered a "public aircraft". "Public aircraft" have all kinds of waivers from FAR's and ATF restrictions. Even in this case with a "public aircraft", the live firing will be accomplished in very tightly controlled circumstances, on a government firing range, with no public around. By the way, the FAA is fine with putting blank firing .50's on warbirds, as long as all the ATF restrictions have been complied with AND the warbird is registered in the Experimental category. Surprisingly, the "hold up" is NOT the FAA.
c) Finally, the FAA is not crazy about .50 caliber blank firings on flying warbirds at airshows. Remember the dropped casings from the video above? The FAA has a dim view of things dropping off aircraft during airshows because of the chance of inadvertently damaging property or killing someone. Even drop tanks on warbirds have to be modified so they can't be jettisoned in flight. Can a "live fire" with blanks be done in the U.S at an airshow? Yes, but you would have to have a very HUGE casing jettison area and a very tightly controlled "fire zone" in which to fire the blanks. I think you could probably work out a solution with the FAA to do this, but you might have to accomplish it at an isolated field, away from civilization - some place like Mojave, or somewhere with no civilization encroachment nearby.
My 2 cents!