Sage International Shotgun Barrel/Magazine Clamp (Battleclamp) has a very nice smooth design with rounded edges. It stabilizes the magazine extension by clamping it to the barrel. That way, you will not damage the extension if you hit something with it. The Sage International clamp fits Remington 870, 1100, 11-87 and Benelli M1, M2, M4, M1014, 12 gauge shotguns.

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The Mesa Tactical Magazine/Barrel Clamp for tactical shotguns is a two-piece clamp made of 6061-T6 aluminum which is lightweight and sturdy. The Mil-spec Type 3 hardcoat is anodized to withstand hard use.

So, what is the purpose of the barrel/magazine clamp? It holds the magazine extension more securely to protect it from damage in case of bumps. Hits are very common when you actually use your shotgun for hunting, training or home defense. Just remember that if you hit something with your magazine extension and it brakes, then the spring, follower and all the ammo will just fall out of the magazine tube. If the magazine tube nut stays in place, then you will be able to put your shotgun loading rounds into a chamber. But if the magazine extension and magazine tube are broken, the barrel will not stay in place while making the shotgun useless.

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Magazine tube extensions for 20 Gauge Remington 870 shotgun

If you own a 20 gauge Remington 870 then you may be interested in magazine tube extensions for your shotgun. These extensions basically add extra rounds to your shotgun’s magazine tube. The extension tube gets mounted right underneath the barrel, which is where the magazine tube and fore-end are located. A normal magazine tube on a 20 gauge Remington 870 can hold four rounds of ammunition. So if you were to add a 2-round extension tube to the end of it then it could fit six rounds of ammunition instead of 4 rounds. This is a lot of ammunition for a shotgun to shoot without having to reload it. The differences between the tubes have to do with the number of extra rounds they can give you and what gauge shotgun you have. The 12-gauge extension tube with two or three rounds for the Remington 870 is the most common and it is priced at about $75.

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There are many magazine extensions available on the market today. New extensions are introduced regularly. I have tested many of them myself, some of them were tested by readers of the blog.

The best magazine extension is the one that fits your shotgun perfectly. Some people like when mag extension is flush with a barrel, some like when extension is little longer than a barrel.

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Thanks to Synchronizor for this fantastic review!

One of the attributes that makes the venerable Remington 870 so flexible is the fact that its magazine can easily be expanded without having to change out the barrel or the base magazine tube. It’s not surprising then, that magazine extension options abound for the 870, and an extension is often one of the first things to be considered when planning a build.

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Magazine Extensions; Single- vs. Two-Piece – Remington 870 Tips & Tricks #11

Highly recommended video about Remington 870 magazine extensions:

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