Add firepower to your favorite shotgun with Carlson's Magazine Extension. They are constructed of blued solid steel and most models come with a spring, base clamp, and a high visibility follower. The threaded tube replaces your magazine cap and gives you the ability to add extra rounds to your magazine. Easy to follow instructions are included. These magazine extensions are great for home protection, competition shooting, and law enforcement. Magazine Spring included Barrel clamp included increases shell capatiy of shotgun constructed from blued solid steel