Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_12834315_2 (barrel_length VARCHAR, name VARCHAR)
### Question:
what are all the barrel lengths whith the name  ar-15a3 competition hbar
### Answer:
SELECT barrel_length FROM table_12834315_2 WHERE name = "AR-15A3 Competition HBAR"