(CNN) — Gun buyers are snapping up weapons, but are running into a big problem - there's not enough ammo to go around.
Gun stores nationwide are experiencing a short supply of ammunition.
Even the big retailers are having a hard time keeping it in stock.
Since January, Walmart has been rationing ammo to three boxes per customer per day.
Store owners say gun purchases spiked around the presidential election and after the December Connecticut school shooting.
According to F-B-I data, seven of the 10 biggest weeks ever for background checks for guns have occurred in 2013.