Manufacturer: Midwest Industries, Inc. MI-SS15
Includes two additional Picatinny rail sections - one approx. 2" long (1.0 oz.) and one approx. 4" long (1.6 oz.) - that can be mounted anywhere on the forearm.
The SS-Series from Midwest gives you Made in the USA quality at an affordable price, and extremely light weight. It features a "no-gap" monolithic look on the fixed top rail, which is mil-std 1913 spec and T marked. Made of 6061 aluminum and hard coat anodized for a lifetime of service, the SS series is compatible with most gas piston uppers and requires minor gunsmithing for installation.
Weight: 16.6 ounces. including two rail sections.