For AR15s with the Picatinny Rail Flat-Top Uppers, nothing beats the versatility of the A4 Removable Carry Handle. Clamp it on when carrying or using its Dual Aperture 1/2 M.o.A. Elevation & Windage Adjustable 300 - 600 Meter Iron Sights. Or slip it off to attach your favorite scope or optic. Machined from Hard Anodized Aircraft Aluminum with Steel Thumb Nuts, Clamping Bar and Sight Parts.