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How difficult are there smr mk4 to install , and what is the preferred length ? I just bought a colt 6920 along with a magpul ubr stock and this rail looks to be just what I'm looking for .
Thanks newbie to modding the ar platform.
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I'm assuming the MK4 install is the same as my MK1. If that is the case, it's super easy IMO. Geissele provides their wrench, which can be used to remove the standard barrel nut, and install the new Geissele nut. It's easier to install then the drop-in rails that use the standard barrel nut IMO.
Are you planning to swap in a low profile gas block, or cut down your Colt FSB? If the former, I went with Geissele's super gas block, and I'm very happy with it.