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Some SIR rails or CASV rails will hold a mini battery, or you could always have your battery in a dummy PEQ box.
Are you sure there's no screw inside the buffer tube? There should be. And the pins in the front sight do have to come out or the front sight will not move. There may or may not also be a grub screw underneath the sight, but you may have to get the pins out first.
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I change primaries like other people change socks.
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