Q LLC TOPRAILFIX191320IN The Fix Top Rail Clear Anodized Aluminum 20" Long
http://www.tandktactical.com/shop/850000857278-q-llc-toprailfix191320in-the-fix-top-rail-clear-anodized-aluminum-20-long-50895
http://www.tandktactical.com/web/image/product.template/50895/image_1920?unique=1970b88
The M1913 Top Rail is compatible with the The Fix by Q to attach accessories such as optics, night vision, or "frickin' laser beams".
