Aim Sports PJBS223 Laser Bore Sight .223 Rem/ 5.56 Nato 635/655 nM Wavelength
http://www.tandktactical.com/shop/815879011459-aim-sports-pjbs223-laser-bore-sight-223-rem-5-56-nato-635-655-nm-wavelength-11428
http://www.tandktactical.com/web/image/product.template/11428/image_1920?unique=1861eb6
These Cartridge Laser Bore Sights come in many different gauges and calibers. They have a brass case and a 5mW red laser.
