Manufacturer: Troy Industries STRX-E3D-12BT-00
Made 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 12.6". Rail and Barrel Nut, Weight 11.9 Ounces.
DPMS, Bushmaster and Remington may have two different height upper receivers. This rail fits the Low Profile DPMS type receiver.
How to tell what type of DPMS LR-308 receiver you have:
The new “Low Profile” upper receiver has a 1/8" wide top portion where the charging handle is installed.
The older “High Profile” upper receiver has a 3/16" wide top portion where the charging handle is installed.