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_17826 ( "Colt model no." text, "Name" text, "Stock" text, "Fire control" text, "Rear sight" text, "Forward assist" text, "Case deflector" text, "Barrel length" text, "Barrel profile" text, "Barrel twist" text, "Hand guards" text, "Bayonet Lug" text, "Muzzle device" text )

### Question ###
what are all the barrel lengths whith the name ar-15a3 competition hbar

### Accurate SQL ###

SELECT "Barrel length" FROM table_17826 WHERE "Name" = 'AR-15A3 Competition HBAR'