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  1. spd301

    Mossberg MMR Hunter Tactical AR15 5.56 .223 Troubleshooting

    Re: Mossberg MMR Hunter Tactical AR15 5.56 .223 Troubleshoot I have a problem with aftermarket sights on the quad rail. I tried to install magpul MBUS sights. The rear sight worked just fine, but when I installed the front sight, it wouldn't tighten down. I tried it on another gun and it...
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