I am curious about the aperture sight mounted at the midpoint on the barrel. Usually a peep sight/ghost ring is mounted as near the eye as possible so that it need only be looked through in order to confirm a repeatable cheek weld. Placing the aperture midway on the barrel I think would complicate sighting, in that, as with open sights, your focus must adjust between 3 different focal planes, rear sight, front sight, and target rather than just 2, front sight and target. I am confident that provided sufficient light, the rifle would shoot better with this arrangement than with open sights. That said, some older shooters who expressed a difficulty sighting with conventional pistol sights have claimed an advantage by mounting a rear aperture sight on their handguns, and an aperture mounted at the midway point along a rifle barrel might well replicate that situation. So I'm looking forward to your first range report, and your own assessment of the mid-mounted aperture under actual shooting conditions.