Add firepower to your favorite shotgun. These magazine extensions are constructed of blued solid steel and come with spring, base clamp, and a high visibility follower. The threaded tube replaces you magazine cap and gives you the ability to add extra rounds to you magazine. Easy to follow instructions are included. The magazine extension tube is great for home protection, competition shooting, and law enforcement. Mfg: Carlsons SPECS: All extensions are 12 gauge only. Overall Length of Extensions: 04500 (8.25"), 04501 (10.5"), 04502 (6.25"), 04504 (14.25"), and 04506 (6.25") Magazine round count is for total capacity using 2 3/4" shells and 1 in the chamber