Question: What are the Colt model numbers of the models named GAU-5A/A, with no bayonet lug, no case deflector and stock of 2nd generation?
Schema: create table table_12834315_1 (colt_model_no varchar, name varchar, case_deflector varchar, bayonet_lug varchar, stock varchar, PRIMARY KEY (colt_model_no))
SQL: select colt_model_no from table_12834315_1 where bayonet_lug = "no" and stock = "2nd generation" and case_deflector = "no" and name = "gau-5a/a"