SALT LAKE CITY (AP) — The number of people stopped from buying guns through the U.S. background check system hit an all-time high of more than 300,000 last year amid a surge of firearm sales, according to new records obtained by the group Everytown for Gun Safety.The FBI numbers provided to The Associated Press show the background checks blocked nearly twice as many gun sales in 2020 as in the year before. About 42% of those denials were because the would-be buyers had felony convictions on their records.