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The CVLife rechargeable magnetic bore sighter is tiny compared with the better-known Wheeler magnetic laser boresighter. Moreover, it recharges via a USB-C cable and can run for over an hour continuously between charges. The CVLife bore sighter, snaps onto the end of your barrel using its magnetic base. Pressing on its pin turns the unit on, emiting a pinpoint laser out to 100ft or more. The accuracy of the device on your firearm is dependent on the squareness of the end of your barrel. Muzzle devices such as flash hiders and compensators can affect the trueness of the laser dot in relation to your bore.
The green laser version projected a point that was visible at 100 yards in daylight (projected onto a shaded target area) with my naked eye. A similar red laser was visible using a 6x magnified optic at that same distance, but not with my naked eye. While the green laser was the better of the two versions CVLife offers, the red laser is preferable when attempting a zero an optic with green illumination or a green reticle. So, I recommend getting both.
SPECS
RECHARGABLE LASER BORE SIGHTER
Laser: Class IIIa ≥5mW
Color: Red / Green
Eye Relief: 15.0mm
Battery: Internal
Connection: USB-C
Capacity: 1hr
Weight: 25.5g
Dimensions: D 25mm x H 34mm