This FX IMPACT TRS  COMPACT RAIL has an integrated bubble level in the rear. Allowing you to quickly check and make sure your gun is level. This is a must have for long range shooting and hunting accuracy. It is designed with an M-LOK system, allowing you to attach a variety of accessories such as laser's weights, flashlight and so on. This SABER TACTICAL TRS RAIL has a built-in 20 MOA i ncreasing your scope elevation to allow for long range shooting. It is equipped with a Delrin shroud clamp to avoid and prevent drooping of your shroud while interchangeing suppressor. Which will minimize or even eliminate any POI .