I don't think there is anything wrong with the NSR. There are a few things I do like about the Geissele though. The Mk4 will have keymod as well, but they are not being produced until April. Take a look at the Geissele thread to see the differences.
https://www.m4carbine.net/showthread...light=Geissele
On a side note. I did find a NSR on rainier arms and picked it up. I will give both a shot, and go with which one I like best.
Does anyone know if the BCM LGB 750 will fit under this rail? I assume it does.
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