Installation Shim Kit, Fusion Engine

Set of 4 precision brass shims to aid with proper nozzle alignment. We have included the most commonly used sizes but shims can also be sanded down for precise fitment. Set includes; 1pc 0.020", 1pc 0.025", 1pc 0.032", 1pc 0.045" While our V2 Fusion Engine is designed to original TM spec, not all manufacturers designed their rifle models to the exact same specifications. Therefore some models may require some minor modification to fit perfectly depending on the design of that particular model. The most common modification requirements we see being needed is shimming the engine in the receiver so that the nozzle is centered in the barrel when everything is installed. Sometimes with rifles where the bolt securing the buffer tube screws directly into the back of the engine, we see that it pulls back on the engine and lifts the nozzle up or occasionally pushes it down. You can visually inspect the nozzle by peering down the muzzle with flashlight (first making sure the rifle is unloade