Our .669" (17mm) diameter base rails are designed to fit on G3 and Cetme C over the rib on the top of the receiver (see picture). Standing 0.374" (9.5mm) tall, they are available in lengths ranging from 3.73" (94.8mm) to 23.81" (604.8mm) to suit your needs. Machined from 1018 steel, these rails are readily weldable without requiring post-weld heat treatment. Each rail features a uniform media blasted (white) finish, sealed in plastic and lightly oiled to protect against corrosion. Precision-machined to MIL-STD-1913 and STANAG 4964 specifications, they provide a secure, reliable mount for optics and accessories.