Can someone tell me where in the 2nd amendment it says you can carry machine guns?

[popeyespappy]

You can get a brand new Browning M2 .50 cal. heavy machine gun from General Dynamics. 

You may need a few pieces of paper to complete the purchase.

Pre 86 manufactured and registered is easy. Get the $200 stamp and buy the gun. If you can afford it... You might be able to find a worn out one for around $50,000.

For a new one you'd need a dealer and/or manufacturer FFL with a Class II or III SOT at a minimum. Even then it might be hard to get General Dynamics to sell you a new one without an approved order from some domestic or international government agency. You might be able to talk them into a sales sample, but that might be hard. Your best bet would be a type 7 manufacturer FFL with a class 2 SOT. Then you could make your own new receiver and buy the rest of the parts elsewhere.

To do it that way you'd be looking at $150 for the FFL for 3 years, $1000 a year for the Class SOT, and $2250 a year to register for ITAR. That's $3300 a year plus whatever state and local fees you have to pay to operate a business just for the licenses you would need. You would have to keep them current to keep the gun. If you don't already have your FFL you are going to have to maintain a brick and mortar store that isn't your residence because the ATF stopped issuing FFL's to home based businesses last year. Even with all that it still might be cheaper over the long run to go that route than buying one registered before the 86 cut off.