Carlson's presents their solution to upgrading the capacity to you favorite shotgun.  Made from blued solid steel, Carlson's Shotgun Magazine Extensions include everything you need to install: spring, base clamp, and a high visibility follower.  Simply by replacing your magazine tube cap and spring, you can add rounds to your shotgun's capacity with ease. The Carlson's Shotgun Magazine Extension is an ideal accessory for home protection, self defense and competition shooting.
Specifications and Features:
Carlson's Shotgun Magazine Extension 04500
12 gauge
8 Shot total capacity with 2-3/4" shells
Spring, follower and clamp included
8.25" overall length
Steel
Blued finish
Fits:
Remington 870/100/11-87/Versa Max
Note:
Tabs inside magazine tube must be removed for installation.
    
            Specifications and Features:
Carlson's Shotgun Magazine Extension 04500
12 gauge
8 Shot total capacity with 2-3/4" shells
Spring, follower and clamp included
8.25" overall length
Steel
Blued finish
Fits:
Remington 870/100/11-87/Versa Max
Note:
Tabs inside magazine tube must be removed for installation.
Very good product
                            
                        
                            Love the new 8 shot magazine. The fit was exact, quick and easy to install. Yes, I will buy another for other 12 ga. guns.                        
                    
                    
                    December 7, 2023
                    
                870 magazine extinction
                            
                        
                            Just what the 870 ordered!                        
                    
                    
                    November 28, 2023
                    
                Miss leading
                            
                        
                            Gets 3 stars because the description for this product wasn't that clear. It isn't 8 total in the tube. It's 7 +1 in the chamber                        
                    
                    
                    December 13, 2020
                    
                Well built product and do
                            
                        
                            Well built product and does what it's supposed to. Here's the thing: The threads don't match the ones on the 870 well. I couldn't get it on at first. Then I got tired of babying it and forced it to thread. Now it seems to go on and off OK, but it should be easy. My other complaint is that the bolt on the tube clamp is the same size as other bolts that usually have a hole drilled  for a sling swivel. This one has a 1' sling mount which I feel is less desirable. Product looks good and works well.                        
                    
                    
                    November 24, 2013
                    
                
                        will this work on a 870 with 20" barrel?                    
                    
                    
                            Answer:
                            Yes this is compatible with your model.
                        
                        
                    
                        I have a Remington model 1100 old style 12 gauge 2/3/4 only will this work with my shotgun ?                    
                    
                    
                            Answer:
                            Yes this is compatible.