Matrix 4.5" Outer Barrel Extension for M4/M16 Profile Barrels

"This extension was too long for my VFC HK416, It looked very ugly, and my flash hider did not fit. Also mine was 5" long, not 4.5". It is not made of steel as advertised. Well I returned and bought the VFC extension. That's what you get for going cheap... If you want to use on another gun, I guess it fulfills it's purpose, but be aware that you flash hider might not fit.