Manufacturer: Troy Industries STRX-E3D-72BT-00Item: ARR-434UPC: 812699014486Made popular on the 5.55/.223 caliber AR and M4 platform, Troy's TRX-308 Battle Rail takes this revolutionary platform and makes it compatible with the AR's larger and more powerful .308 brethren. Sleek, lightweight, and low profile, it provides a stable foundation for mounting optics, bipods, or other accessories to your low profile DPMS LR-308 rifle. Included with the package is the handguard, high strength barrel nut, and three quick detach rails. Machined from 6061-T6 hardened aircraft aluminum and finished in Mil-Spec Type III hard coat with Teflon. Length 7.2". Rail and Barrel Nut, Weight .93 Ounce.
The older “High Profile” upper receiver has a 3/16? wide top portion where the charging handle is installed.