Windham Weaponry does not state if the Windham Weaponry R18FFT-308 LE is DPMS pattern or not. I recommend contacting Windham Weaponry for that information. However, if the Windham Weaponry R18FFT-308 LE is DPMS High Profile that model rifle would need to have the gas block replaced with a low profile gas block to fit the Midwest Industries DPMS 308 High Combat Rail M-LOK Handguard.