The ST-10 TPAL is a fixed magnification scope that is made for target engagement out to 1000+ yards. Very similar to the standard ST-10, but the parallax adjustment is on the turret instead of the objective. Reliable adjustments and extreme durability make this scope a very affordable medium-long range tool that will fit well with most rifle platforms. Basic design has a 30mm tube, US#1 elevation and windage adjustments, and a 37mm objective. MOA and MIL adjustments, along with MOA or MIL reticles allow you to use whatever combination you desire.Optional elevation and windage knobs, reticles, lit reticle modules and finish colors available at an additional charge. Standard 30mm tube diameter will yield 100+MOA of total elevation adjustment. Scope body, eye piece, objective housing and any and all other body parts are made with 6061-T6 aircraft aluminum and are then coated with a matte black type III hard anodizing. Elevation knobs materials consist of stainless, brass and 4130 Chrome Moly, ball detents are tungsten with a stainless steel jacket. Dual elevation and windage rebound springs will insure decades of reliable and accurate adjustments.