Long gun

The Firearms Owners Protection Act of 1986 liberalized some of these requirements. Long guns (rifles and shotguns), but not handguns, could be sold across state lines. Guns and ammunition could be purchased through the mail subject to various restrictions. Gun dealers could sell firearms in a place other than a store (such as a flea market or a gun show). Record-keeping requirements were reduced. 

Congress passes the Firearms Owners Protection Act, a law that rolls back some provisions of earlier federal firearms legislation. For example, it reduces paperwork violations for firearms dealers from a felony to a misdemeanor and allows the interstate sale of long guns by dealers. However, it also increases penalties for drug traffickers who possess firearms and incorporates an amendment that essentially bans the purchase of automatic firearms by civilians if the guns were manufactured after the enactment of the law. 

Muzzle Brake. (Freins de bouche in Fr, M lin-dungsbremse in Ger). A cylindrical device with flanged or baffled surfaces which is attached to the muzzle of a gun, usually by threads, to offset a long or complete recoil of the gun when fired. The expanding proplnt gases strike the baffles, thus pushing the gun barrel forward. This action can shorten the actual recoil distance, or it may relieve an overloaded recoil system. The latter would occur when a conventional gun was deliberately overloaded to increase the projectile velocity... 

In the field of forensic technology, there has long been a considerable need for detecting gunshot residues on the hands of an individual suspected of having fired a gun in a criminal act. 

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