I have a Remington 870, 18" barrel and was wondering which lenght will fit my gun best? A +2 or +3 mag extension.? Right now I looking at choate extensions. The 870 holds four 2 3/4 shells. Thanks for the help.

The +2 extension is going to be about flush with the 18" barrel while a +3 will extend past the barrel. In the pictures below, the black 870 has an 18" barrel and the factory +2 extension while the green 870 has a 20" barrel and the factory +3 extension. You can see that with the +3 extension it sticks past the 20" barrel about 1/2". Also, the Choate extensions are great stuff but if you go with a +2 extension you may want to also look at the Wilson Combat extension. It's a good product at a reasonable price.

http://homepage.mac.com/jgregjones/.Pictures/Shotgun/870T.jpg

http://homepage.mac.com/jgregjones/.Pictures/Shotgun/G870.jpg

Here is the 1 shot wilson extension I have, I did have a remington 2 shot but it made the gun unbalanced and heavy.

http://usera.imagecave.com/mastinson/870/Image006.jpg

Here is a pic of my Choate +2 on an 18 1/2" Remmy.

Thanks for the help and pictures.