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_name_47 (muzzle_device VARCHAR, barrel_twist VARCHAR, stock VARCHAR)
### Question:
What is the muzzle device with a 1:7 barrel twist and a stock 4th generation?
### Answer:
SELECT muzzle_device FROM table_name_47 WHERE barrel_twist = "1:7" AND stock = "4th generation"