[alpo]

I recently saw a Mac-10 clone chambered in 5.7x28.
It uses the FNC pistol magazine that holds 20 rounds, expandable to
30 with a conversion kit. (10 rounds for you poor saps in CA.)

I considered getting it until I found out the store had been out of
ammo for two months. Apparently someone is taking all the the stuff produced and there is precious little left over. It is a fairly obscure cartridge and there are only a couple of production sources.

Also, it operates at pretty high pressure and the cases have a special coating to make them feed properly so reloading is tricky.

[Charles Martel]

I considered getting it until I found out the store had been out of ammo for two months. Apparently someone is taking all the the stuff produced and there is precious little left over. It is a fairly obscure cartridge and there are only a couple of production sources.

The FN 5.7 cartridge has developed a real following among the cartel types along the Mexican border. That alone could account for an ammo shortage (though the drug gangs are also getting their hands on the military-spec ammo that we aren't allowed to purchase).