Midwest Industries
15-inch M-LOK rail for DPMS High .210-inch threaded uppers with a 1 7/16-16 barrel nut.

Midwest Industries' 15-inch Combat Rail supplies the standard threaded handguard path that the catalog previously lacked. Its .210-inch top-rail alignment and 1 7/16-16 barrel nut match the Aero M5 assembled upper, while the 1.50-inch inner diameter leaves practical clearance around common gas blocks.
This is a DPMS Gen 1 High rail, not a DPMS G2 rail and not an Aero M5E1 direct-mount handguard. The builder keeps those interfaces separate.
Add the Midwest Industries 15" .308 Combat Rail, DPMS High to your build and see how it enhances your platform.