Chamber-View AR-10 Type ECI Gun Lock, Orange New design fits most ar-10 modern sporting rifles (msr) and clones accepting 308 caliber and 7.62 mm ammunition Compatible with Chamber-View fast-pull tags for fast and easy removal from the ejection port Provides instant recognition firearm is safe to other Shooters Aids against accidental closing of the action Prevents contamination from the elements and will not Melt in a blazing hot barrel