What is the barrel length for a cold model le6921sp?
CREATE TABLE "le_series_models" (
  "colt_model_no" text,
  "name" 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 "barrel_length" FROM "le_series_models" WHERE "colt_model_no"='LE6921SP';