Aim Sports PJBS76239 Laser Bore Sight 7.62x39mm 635/655 nM Wavelength
http://www.tandktactical.com/shop/815879011626-aim-sports-pjbs76239-laser-bore-sight-7-62x39mm-635-655-nm-wavelength-11462
http://www.tandktactical.com/web/image/product.template/11462/image_1920?unique=ecc9680
These Cartridge Laser Bore Sights come in many different gauges and calibers. They have a brass case and a 5mw red laser.
