Personally I vote 16" for the OBR.
Unless your going past 750m the 16" does a very good job.
Actually when the Super Tap is released in 3/4x24 , we are currently planning on also making them in 5/8x24 for the OBR and others with that threading.
We are redesiging it currently to be a little more effective than the older SR-25 BR Enhanced Comp, like Costa has on his SR-25 EM Carbine.
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