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As with most of you I’m trying to make my 28” 870 express into a home defense gun with a 18” barrel. This tube extends EXACTLY to fit a 18.5” barrel. Will poke past a 18” by a little bit. That said, it matches the flat perkerized perfectly. It’s not parkerized but it’s a flat finish that matches. My ONLY complaint is the tube got scratched during delivery because of how lame the Remington packing is. Finish isn’t the greatest either but either is the factory parkerized finish. They wear about the same. In short, if you have a new gen parkerized 870 and want a HD set up this tube is perfect for a 18.5” barrel.
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Installation requires removal of two detents. This is straightforward work, but will permanently change the original firearm, and I don't know if it can be returned to original configuration. The tube magazine might not function after these detents are removed, and the extension is not used.
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I own a late model 870 with two retainer dimples stamped into the magazine tube. Before installing I took my Dremel tool and ground then smoothed and polished the area. I cleaned then "blued" the grounded off area so it wouldn't rust,then oiled it . I read with the older 870's you don't have those internal dimples to deal with so if your not handy with working on your guns you may have to have a gun smith put this extension on although the degree of difficulty is pretty low.
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Fits ATI MB3R SBeam 12 GA shotgun so I'm happy. Just had to make minor adjustments to the gun itself.
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If you have a newer 870 you will need to remove/ smooth out the dimples in the magazine tube. I picked up a $20 drimmel that did that trick. Just take your time and eventually you’ll have a smooth cylinder. This prevents the spring from sticking.
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