44AMP said:
How can anyone doubt that a .50cal (BMG) will take down an airplane? During WWII, the .50BMG was the premier gun for air combat. Against combat aircraft, many of which had armor plating to protect the pilot.
Yes, during WW2, when planes had piston powerd propellors and the top speed was well below the Mach. In the Korean War our F-86 Sabre Jets went up against the MiG-15, which had, IIRC, 23MM. cannon. The Sabre had .50 cals. They proved less than effective against jets. We learned to up the firepower in jetfighters and modern jets since then use 20MM. cannon, called "TWENTY MIKE-MIKE" by pilots.
If you had a .50 BMG and could shoot an airplane on landing or takeoff, critical points in the flight envelopes, you probably could cause the aircraft severe problems IF you could put the bullet into an engine. But you probably could do the same with .338Lapua or a lot of other heavier cartridge.
Just putting a round through the fuselage wouldn't do much. Oh, it would easily kill any human it passed through, for near sure, but today's aircraft don't decompress, they already have valved openings and a bullet hole would just make the air pressurizing system work about 0.00003% harder.
You make good points about machine guns, but the guns the polticos are talking about are Barrets and either bolt action or semis, and real big heavy rifles.
The politicos can ban the .50's, but that won't prevent terrorists from other alternatives if they remain determined to attack our aircraft and aviation industry. They could smuggle in man-portable infra-red guided missiles, if they wanted to.