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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. Products purchased at ARD American Rifle. All parts are sold subject to public law , local, state and federal ordinances, rules, regulations etc. it is the sole responsibility of the buyer not the seller to consult legal counsel for interpretation of any laws applicable to the area of intended use.
ARD COMPLETE AR-15 BOLT CARRIER GROUP 556/223 #0058
PRODUCT SPECS
CROME LINED
BOLT CARPENTER STEEL MPI TESTED
Complete bolt carrier group for 556 rifles. Includes gas key
cam pin, firing pin, firing pin retaining pin, and 556 bolt head assembly.
The ar 15 bolt carrier group, 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. 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 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.