WEAVER AR FLAT TOP 20MOA RISER RAIL Turn your flat top AR-15 or M16 into the perfect optics platform with our Flat Top Riser Rail. This riser rail is made from aircraft-grade 6061-T6, aluminum and has Type III hard coat anodizing for years of rugged use. Engineered to provide the optimal mounting height for all types of optic and ring combinations, the Flat Top Riser Rail is available in both standard and quick detach models and a 20MOA cant version. Engineered to provide optimum mounting height for all types of optic and ring combinations Aircraft-grade 6061-T6 aluminum with Type-III hard coat anodized finish