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_67566 ( "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 is the muzzle device with a 1:7 barrel twist and a stock 4th generation?

### Accurate SQL ###

SELECT "Muzzle device" FROM table_67566 WHERE "Barrel twist" = '1:7' AND "Stock" = '4th generation'