Carlsons magazine extension win 1200/1300 7-shot 12ga FEATURES-For Winchester 1200/1300-7 shot-Blued solid steel-Comes with spring, base clamp, & high visibility follower-Gives you ability to add extra rounds to your magazine-Easy to follow instructions included Other Features: Threaded tube replaces magazine cap.Comes w/spring, base clamp, & high visibility follower.Fits winchester 1200,1300 12ga