It shares a 30mm" one-piece tube construction" and all of the optical quality as their acclaimed M30 series" but in a much more compact design. Thus" the T30 riflescopes are ideal for the very demanding tactical shooter. The included offset rings makes mounting this compact scope simple. The 3X-12X50mm includes their unbreakable glass engraved" mil-dot reticle for deadly accurate targeting. This unique reticle takes the guess work out of hold over angles for even the most difficult of shots.