This microprism is part of Primary Arms SLx optics line. SLx optics built the reputation for innovation, reliability and value. The SLx 1x MicroPrism is an advanced optical system designed from the ground up in an ultra-compact housing, allowing use of backup iron sights and magnifiers. SLx optics built the Primary Arms reputation for innovation, reliability, and value. All SLx optics undergo rigorous field-testing during development to best serve you in any environment.