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_1 (muzzle_device VARCHAR, hand_guards VARCHAR)
### Question:
What's the type of muzzle devices on the models with round hand guards?
### Answer:
SELECT muzzle_device FROM table_12834315_1 WHERE hand_guards = "Round"