Aligned reflex scope in 10 min. - NcStar 12 Gauge Cartridge Red Laser Bore Sighter

I rolled it on a flat surface as soon as I opened it, dot was flat at 15 yards. It slides into the chamber effortlessly. I closed the breach, no rattle exact fit. I tuned the reflex red dot to the lazer and ejected the sight, done in 10 minutes. There is no off/on switch, you loosen the cap or remove the batteries to turn it off. Just as well, a switch would interfere with the fit. My application is a home defense tactical shotgun,I can't see any use for this on my duck gun, the vent rib already works fine on that.