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My CQBR OB shoots on average 430 fps with .2s. My bros hk416 OB shoots around 450 fps with .2s. This is for the factory stock OB and not the OB upgrade kit, if it makes a difference.
Has anyone noticed that part 66 for the OB is slightly different than the CB version? My part 66 has a screw and an additional metal piece attached to one of the prongs.
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