The FBI’s background check system for gun sales processed more than 2.3 million checks in October, setting an all-time record for the month.

There were 2,333,539 gun-related checks processed through the National Instant Criminal Background Check System, known as NICS, last month, according to FBI documents posted on Monday. That represents an increase of more than 350,000 checks over the previous October, itself a record. It’s also the 18th month in a row to set a record.

With two months to go, 2016 has already seen 22,206,233 NICS checks, making it the second highest year for checks in the history of NICS with only 2015 seeing more.

NICS checks are considered to be one of the most accurate indicators for gun sales because nearly all sales made through federally licensed firearm dealers require a check by law. The number of NICS checks in a month do not represent an exact count of gun sales for a number of reasons. For instance, many states require a NICS checks for those applying for gun carry permits, and many states do not require NICS checks for sales between private parties.

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