The Gemtech LID (Linear Inertial Decoupler) piston is a component used to mount certain Gemtech suppressors to compatible handguns, in this case for the H&K USP in .45 ACP. By decoupling the suppressor from the barrel's recoil motion, a Nielsen-device style system helps pistol-caliber suppressed firearms cycle reliably. It is a precision-machined replacement or conversion part for owners building or maintaining a suppressed pistol setup, and fitment depends on the specific host firearm listed in the product name.

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