Also, to avoid unnecessary damage to the front sight, A.R.M.S. One of the more popular features of the #40L-F is its lower-than-usual profile which gives the shooter far more clearance when mounting an optic to their AR-15. Also, unlike some of the other BUIS out there like the MBUS, the front sight of the #40 can be mounted to the gas block without any issues. Like a lot of other BUIS for the AR-15 platform, the #40 rear sight comes with a flip-adjusted aperture that switches between short and long-range shooting. Their low-profile design makes them excellent for your flat-top due to the fact that they take up very little space and can be folded down when not in use. The #40 front ($130) and rear sights ($135) are a reliable set of BUIS that will make sure that your AR-15 doesn’t lose accuracy in the event of an optical mount getting banged up or malfunctioning. In addition, the tritium really helps to make the sights visible, which is perfect for low-light shooting. This makes it an excellent alternative for anyone who’s not so keen on the polymer sights and wants something actually made out of metal – as the name iron sight implies.
The best feature of the Micro BUIS is its rugged design. You can also flip the rear sight aperture to choose between short/medium-distance and long-distance (300 – 600 yards) shooting. They clamp easily to your Picatinny rail system where they remain folded down until you need to put them to work.
