.223/5.56 laser bore sight module. Designed to make it quick and easy to bore sight your rifle chambered in .223. This laser is also the basis for the AimSHOT laser bore sight system and is used in conjunction with the AimSHOT Arbors to bore sight other rifle calibers. 

The MBS223 also comes with a modular battery pack that extends laser run time to 20+ hours. The unit is operable with either the included button cell batteries or the included modular battery pack that uses 2 AAA batteries.
 
This is the system that AimShot recommends be used with our arbors for any caliber laser bore sighting. It is the most versitile and accurate system on the market, and should not be compared to any other chamber based bore sights. AimShot has the original patent on the chamber laser bore sight and still makes the best system. More accurate, more durable, longer lasting and functionally superior to any other system on the market. Used extensively by manufacturers in the industry, and the US military. The original and still the best. 
 
The AimShot laser bore sight system is designed around a single high quality laser, 223 for the rifle calibers, and a system of hollow arbors that are designed to fit over the 223 laser and fit in the chamber for other calibers. So if you want to bore sight a 308, you would need the 223 laser and then the appropriate arbor (AR243 in this case will fit all 308 based calibers). Being able to bore sight additional calibers by purchasing an arbor is much more cost effective.