Place chickpeas and red onions in a bowl. Sprinkle with 1/4 teaspoon salt and toss. Let sit for 10 minutes.
Meanwhile, prep the romaine, artichoke hearts, pepperoncini, olives, and sun-dried tomatoes.
In a small bowl or jar, whisk together olive oil, red wine vinegar, oregano, pepper, and remaining 1/4 teaspoon salt.
Combine all salad ingredients in a large bowl. Pour the dressing over and toss well to coat.
Serve immediately or refrigerate for up to a day. Toss again before serving.