The US-Optics SN-3 3.2-17X TPAL is a variable magnification scope that is made for target engagement out to 1500+ yards. Turret Parallax Adjustment is utilized on this model vs. an adjustable objective. This can be had with the knob on the left, right or top of the scopes turret. Reliable adjustments and extreme durability make this scope a very affordable 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 44mm diameter 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, tube diameters and finish colors available at an additional charge. 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 carbide with a stainless steel jacket. Duel elevation and windage rebound springs will insure decades of reliable and accurate adjustments.