The link for the data is available here
. NICS background checks had never hit 2 million until November last year and it has stayed above that until March.
Interestingly, gun checks were already quite high prior to the Newtown shooting on December 16th, presumably due to Obama election. Indeed, the two days prior to the tragedy were the 8th and 9th highest on record. The difference in sales between the 18th at 134,691 and the 15th at 128,823 was only 5,868, just a 4.6 percent increase. The sales on the 17th didn't even reach the top 10, so they were below sales on the 15th. The bigger increases started on the 19th.