Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_16439764_1 (gun VARCHAR, time_to_ft__m__at_55°__seconds_ VARCHAR)

### Question ###
What gun has a time to feet ratio of 18.8 at 55 degrees?

### Accurate SQL ###

SELECT gun FROM table_16439764_1 WHERE time_to_ft__m__at_55°__seconds_ = "18.8"