Andy, whose unsurpassable L119A1 I featured last summer, posted the above pic on Facebook.
It aptly answers what must be the most frequently asked questions about L119A1 front sights. Because anything posted on Facebook is ephemeral, I wanted to record the difference between front sights here.
The L119A1 SFW (16″ barrel) features a reinforced front sight.
The L119A1 CQBR (10″ barrel) features a standard front sight, with the bayonet lug removed. This is to facilitate use of the ubiquitous SureFire can.