What kind of hand guards are associated with a rear sight of A1 and stock of A2?
CREATE TABLE "diemaco_colt_canada_models" (
  "colt_model_no" text,
  "diemaco_model" text,
  "stock" text,
  "fire_control" text,
  "rear_sight" text,
  "forward_assist" text,
  "barrel_length" text,
  "barrel_profile" text,
  "barrel_twist" text,
  "hand_guards" text,
  "bayonet_lug" text,
  "muzzle_device" text
);
SELECT "hand_guards" FROM "diemaco_colt_canada_models" WHERE "rear_sight"='A1' AND "stock"='A2';