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ARman
First buy a new smooth bore 18 barrel from mossberg. Yes mossberg, they make 870 barrels too check out their website. Get the $94 dollar parkerized one, so it will match the finish on your express.
Next, order a new, "old version" 870 spring retainer from remington. It is a little round piece of metal that will jam into the end of the mag tube to hold the spring in, when using your long hunting barrel. Now you have to flatten out the little tabs in the mag tube so your mag extention will work properly.
When you use the shotgun for hunting (long barrel and no mag extention) put the original spring, new (old version) spring retainer and round limiter in covered with your original cap. When using the shotgun for self defence put the short barrel on, long spring and mag extender. Hopefully the rounds will still slide by the flattened tabs well when used in this way. Good luck.
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