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Sir, That is true ,direct impingement system spew foul gasses with heat and carbon, depositing black crud all over the bolt carrier.This will obviously affect the reliability of any rifle if not cleaned at regular intervals.But ,there seem to be a solution to it ,that is keep the bolt carrier...

Sir, Contrary to what most people think excalibur seem to have direct impingement gas system,which means less reliable if not cleaned properly.Furthermore, the Excalibur incorporates a “direct gas-tapping angle”, which reduces its recoil, or the “jump” when it is...