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Posted: 2/3/2026 7:23:54 PM EDT
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As the 870 magazine tube is brazed into an 870 it isn't easily removed to be shortened and then re-align. Its also not easily cut short and re-threaded for the mag cap as the threads are not easily cut or replicated without a lathe and tube removal. Lets say someone wants to make a shortened tube for a Super Shorty SBS project - would it seem to be easiest to cut out a desired length section of tube and re-weld the section with the threads back on - Using a copper pipe to align - Yeah sounds crude but know some decent welders and could clean it up inside and out. I would plan on shortening the forend/rails similarly and re-solder the barrel ring lug after heating and removing - this can be done and sometimes need height adjustment using a laser to help align it to point of impact again as the barrel has a taper. Has anyone done this with an 870 - I suspect many of you will say just send it off to a gunsmith - I get it, that is always an option. Curious for DIY-ers that may have done it or have any other thoughts Thank you. |
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I've shortened several mag tubes on 870's, both to 3 shot and 2 shot sizes. I made a mandrel to hold the whole action in the lathe and turned the tube down and rethreaded it. My original thought was to cut and reweld but it would be a major undertaking. For the forend, I made another mandrel to hold that and shortened it too. I've found some forends for the shorter Special Field models on gunbroker but I just shortened the originals. |
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Originally Posted By BradN: I've shortened several mag tubes on 870's, both to 3 shot and 2 shot sizes. I made a mandrel to hold the whole action in the lathe and turned the tube down and rethreaded it. My original thought was to cut and reweld but it would be a major undertaking. For the forend, I made another mandrel to hold that and shortened it too. I've found some forends for the shorter Special Field models on gunbroker but I just shortened the originals. Thanks for the info - yes - Lathe work is proper and I like the idea of being able to do it while still attached to receiver. I don't have access to a lathe or the skills to run one. This is where improvisation with what can be sourced skill-wise locally to me vs what is best might need to be balanced. 
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