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ARD AR15 5.56 STAINLESS SPIRAL IN BLACK BULL 1-8 TWIST BARREL 20 INCH #FB21
PRODUCT SPECS
BARREL 5.56 WILL ALSO SHOOT 223
Gas System: Rifle Length Gas System
Chamber: 5.56 with
Twist Rate: 1/8 button rifled
Barrel: 20" BULL ,416R Stainless Steel 9.36 dia
Muzzle Device: THREADED 1/2 X 28
Many materials being used in that industry were incorporated into the AR design such as: plastics, aircraft grade aluminum (anodized), and other alloys, which offered strength but were much lighter than conventional materials used in firearms at the time. These developments not only saved on weight but also didn’t warp or splinter like wood. The ar15 spiral bull barrels, originally designed by Eugene Stoner, chief engineer at ArmaLite (a division of Fairchild Engine and Airplane Corporation), was a revolutionary design when it was first introduced. The receivers and magazines were made of aluminum, which is light. However, aluminum is also much weaker than steel. In order to compensate for the weaker/lighter alloy, hard-coat anodizing the receiver gave it a hard, durable outer shell. The safety and magazine release are easy to find and manipulate, which allows it to act as an extension of the user. In 1967, the USAF adopted the rifle and made it their primary infantry weapon for all of the branches of the US military.
The AR15’s come available in a wide range of configurations, which range from short carbine-length models with features such as adjustable length stocks and optical sights, to heavy barrel models. Upper receivers that incorporate barrels of different weights and lengths, and handle different caliber ammunition, abound for this rifle. They are very easily installed, due to the rifle's modular design. Semi-automatic and automatic variants of the AR-15 are effectively identical in appearance.
Automatic variants have a rotating selective fire switch, allowing the operator to select between three modes: safe, semi-automatic, and either automatic or three round burst, depending on model. Civilian AR-15 models usually do not have three-round burst or automatic settings on the fire selector (e.g., Bushmaster Firearms. In semi-automatic only variants, the selector only rotates between safe and semi-automatic.