MAG-NA-PORTING uses electrical discharge machining (EDM) to remove the metal,it leaves no machining marks, no burs, no nothing. It has no effect on accuracy,velocity or noise level. My 1895 shoots clover leafs at 100yrds.There has been a couple gun magazines that have done db tests,proving that there is no effect on niose levels. MAG-NA-PORT does not use multi round holes, its trapezoidal port is not as noticeable as marlins multi round ports.I would love to show you a picture but have not yet set up to do so.