Several models are worth mentioning, although it depends on the shooter's needs and the type of optic they choose. Some sights also mount on rear sights or front sight mounts. Most rear sight rails are made of steel, so it’s resistant to corrosion and rusting. Reflex sight users should mount as far forward as feasible, thus they should choose a handguard or railed gas tube and match it with a micro red dot. A dog-leg rail is the greatest choice for holo sights for instance the EOTECH XPS2-300 Blackout since it enables them to be positioned as near to the bore as possible. The majority of holo sights are too tall to be utilized properly on any other mount, so this is significant. Magnified optics are generally best mounted on side rail mounts because they provide enough additional height to allow for appropriate clearance of the scope's objective. The disadvantage is the extra weight that a rail, rings, and a scope added.