On this method, the front bring about fires the rifle barrel while the rear bring about fires the remaining shotgun barrel, that's choked for Brenneke slugs. Sliding the selector again retracts the rear sight and will make the entrance trigger fireplace the proper shotgun barrel, that is choked for birdshot. https://landenvvtwt.ja-blog.com/31093882/m30-pistol-things-to-know-before-you-buy