One less round with 3 shells. The new model Remington 870/1100/1187 shotgun have 2 dimples that will have to be sanded /ground down or drilled out with 3/16 holes before spring will extend up into the magazine extension. The older model Remington 870/1100/1187 will readily accept this extension without any alterations.
If for some reason you are replacing a new Remington tactical short barrel that you bought brand new within a year or so that already has short barrel installed from the factory and has a one piece mag tube that holds 6 rounds. This barrel is packed in a hard plastic package from Carlsons. This package scuffs the barrel. No, this will not fit left handed Remington 870's. No this will not fit Remington clones.Product must be in new condition and or unmodified. The item "REMINGTON 870 18.5 HOME DEFENSE SUPER BARREL AND +2 ROUND EXTENSION KIT (NEW)" is in sale since Thursday, July 21, 2016. This item is in the category "Sporting Goods\Hunting\Gun Parts\Shotgun". The seller is "danmanscollectables" and is located in Farmersville, Texas. This item can be shipped to United States.