As a result, Springfield Armory designed a muzzle brake, which they installed in place of the standard flash suppressor on all models that were sold in California. The muzzle brake reduces climb of the barrel, allowing the operator to aim more quickly for another shot. Most of the M1A rifles manufactured since 1971 were made for the commercial market, and thus were only capable of semi-automatic fire. Springfield Armory, Inc. and Smith Enterprise Inc. were the two companies that produced select fire M14 type rifles for civilian ownership. Up until May 1986, Springfield Armory, Inc. had a Full Auto Department at their factory in Illinois. A few M1A rifles were converted to full-auto fire and registered with the ATF by Class II manufacturers like Neal Smith and Rock Island Armory. The receivers of these select fire rifles have the selector lug and operating rod rail cuts for the connector assembly. Besides the standard M1A, Springfield Armory also produces multiple variants. The M21 Tactical and M25 White Feather have been discontinued. The Loaded variants are available with either a walnut or synthetic stock, and one model comes with a Precision Adjustable Stock. All Loaded models include the following features: The Loaded models do not have the action glass bedded into the stock as do the National Match models. While the National Match features included lend considerably to the Loaded models' accuracy, they are not a true National Match rifle. Two M1As are advertised as match rifles, the National Match M1A and the Super Match M1A. The National Match is a more basic model, while the Super Match is more customizable has additional features on some models such as a McMillan stock and a Douglas stainless steel barrel. The Scout Squad is an M1A marketed toward law enforcement users. It has an barrel, a forward-mounted optical sight base, and a proprietary muzzle stabilizer. It is advertised as being optimal for Aimpoint optics, although most mounts attached to the factory accessory rail will still require a cheekrest in order to get the proper weld. It is available in both wood stocked and synthetic furniture options with different colours of wood and synthetic stocks. The SOCOM 16 and SOCOM II are modern variants of the M14 manufactured with lighter materials. SOCOM is an abbreviation which refers to the United States Special Operations Command. These variants have a barrel that is just slightly longer than the minimum barrel length of permissible without taxing and registration under the National Firearms Act in the United States. The gas system was reworked to ensure proper operation with the shortened barrel, and a new muzzle brake was added to help soften recoil.