Carlson's Benelli M4 Magazine Extension, 7 Shot - Black - 4508

These magazine extensions are constructed of blued solid steel and come with spring, base clamp with swivel stud (included) to work with quick detachable swivel (not included), and a high visibility follower (some extensions require factory follower and will not come with one). 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. See chart below for the make/model and the magazine capacity.

Features:

• Overall Length of Extensions: 04508 (5-inch)
• Magazine round count is for the total capacity using 2 3/4-inch shells including 1 in the chamber, When using 3″ shells you lose 1 shell capacity. When using 3 1/2″ shells you lose 2 shell capacity.
• Example: 8 shot extension= is 7 (2.75″ shells) in the extension and 1 in the chamber, 6 (3″ shells) in the extension and 1 in the chamber, or 5 (3 1/2″ shells) in the extension and one in the chamber.