The Patent Pending Brass Buster is a an ambidextrous brass deflector designed to facilitate weak side shooting, and is ideal for LEO, military, and even three gun competition use. No more ejecting brass in the teeth or face! The Brass Buster is simply pressed over the stock, and will snap into place. It clamps with enough force to stay in place and not shift backwards during firing, but can quickly be installed and removed without any need for tools, adhesives, or velcro. The Brass Buster is reversible and will work whether you rifle is set up for right or left side ejection. Simply install the deflector "Tee" shield on the ejection port side of the gun. If later you switch the ejection direction of your rifle, simply remove your Brass Buster, rotate 180 degrees and snap back on and you are back in business! The Brass Buster is compatible with all Steyr Aug, MSAR STG-556 (all generations) and E4, and all TPD AXR series rifle. It is proudly made in the USA and packaging includes both the Brass Buster and an instruction sheet on installation and use. See the Youtube video on installation and use here: http://www.youtube.com/manticorearms#p/a/u/2/g-v-QT6WdvU