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_12834315_1 ( muzzle_device VARCHAR, hand_guards VARCHAR )

### Question ###
What's the type of muzzle devices on the models with round hand guards?

### Accurate SQL ###

SELECT muzzle_device FROM table_12834315_1 WHERE hand_guards = "Round"