TDB DOT SIGHT is module type. It can be used any gun as heavy machine gun, normal gun. TDB Dot sight components are two size of lens and controll part. The easy-to-use adjusters with audible clicks allow for quick windage and elevation adjustments. With eleven available brightness settings, the reticle can be manually adjusted by pressing the plus or minus buttons on either side of the unit. The most of strength for TDB Dot sight is light weight, and when adjusted the click, only reticle part is moving. It is very safe for damage.