Turn your flat top AR-15 or M16 into the perfect optics platform with our new Flat Top Riser Rail. Its multiple-slot design provides plenty of options when setting eye relief. This riser rail is made from aircraft-grade 6061-T6 aluminum and has a durable black matte finish. It is engineered to provide the optimal mounting height for all types of optic and ring combinations. The new Flat Top Riser Rail also features a thumb nut for quick reliable installation and detachment.