This Daniel Defense M4 V7 Pro features a M-LOK attachment technology with Daniel Defense MFR XS 15. rail. It has a cold hammer-forge barrel with a Gen II muzzle climb mitigator and a rifle length gas system which provides smooth and reliable cycling under any condition. Its free-floating MFR XS 15. handguard offers incredible weight savings as well as superior cooling, ergonomics, and modularity while maintaining sthe strength and durability.