Military Moron reviewed Ceturion 5.56 Modular Rail(CMR) System. The rail is an one piece system that is only 13.2oz(12 inch) 14 oz(14 inch).
Centurion Arms website:
https://www.centurionarms.net/index.php?option=com_k2&view=item&id=56:new-product-556-cmr-rail-system&Itemid=189
From: Military Moron