Got the new Evanix shroud yesterday and installed it in about 20 minutes. Just unscrew the old shroud and screw in new one, does not come with instructions. Added 2 curler type baffles from original shroud into new unit. Used a light oil on outside of shroud and barrel o-ring to help slip through barrel ring & prevent scratching when installing. Really nice piece, matches factory RS II finish perfectly adds about 7"to length of rifle. Tested it today outdoors. Huge difference in report, sound was down at least 50% on my .25 RS II. My adult son even had to try it and confirmed big difference. Neighbor even came over couldn't believe it was the same gun. Excellent bang for buck! Can't say enough.